251242331240 has 16 divisors (see below), whose sum is σ = 565295245380. Its totient is φ = 100496932480.

The previous prime is 251242331233. The next prime is 251242331273. The reversal of 251242331240 is 42133242152.

It can be written as a sum of positive squares in 2 ways, for example, as 250306093636 + 936237604 = 500306^2 + 30598^2 .

It is a super-3 number, since 3×251242331240³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3140529101 + ... + 3140529180.

Almost surely, 2^251242331240 is an apocalyptic number.

251242331240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251242331240 is an abundant number, since it is smaller than the sum of its proper divisors (314052914140).

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

251242331240 is a wasteful number, since it uses less digits than its factorization.

251242331240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6281058292 (or 6281058288 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 251242331240 its reverse (42133242152), we get a palindrome (293375573392).

The spelling of 251242331240 in words is "two hundred fifty-one billion, two hundred forty-two million, three hundred thirty-one thousand, two hundred forty".