251113140 has 36 divisors (see below), whose sum is σ = 761710404. Its totient is φ = 66963456.

The previous prime is 251113129. The next prime is 251113141. The reversal of 251113140 is 41311152.

251113140 is a `hidden beast` number, since 2 + 511 + 13 + 140 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 88397604 + 162715536 = 9402^2 + 12756^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×251113140³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251113141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 697357 + ... + 697716.

Almost surely, 2^251113140 is an apocalyptic number.

251113140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251113140 is an abundant number, since it is smaller than the sum of its proper divisors (510597264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251113140 is a wasteful number, since it uses less digits than its factorization.

251113140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395088 (or 1395083 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 251113140 is about 15846.5497822081. The cubic root of 251113140 is about 630.8941196982.

Adding to 251113140 its reverse (41311152), we get a palindrome (292424292).

It can be divided in two parts, 2511 and 13140, that added together give a palindrome (15651).

The spelling of 251113140 in words is "two hundred fifty-one million, one hundred thirteen thousand, one hundred forty".