251742141 has 16 divisors (see below), whose sum is σ = 426230400. Its totient is φ = 143852544.

The previous prime is 251742109. The next prime is 251742143. The reversal of 251742141 is 141247152.

251742141 is a `hidden beast` number, since 2 + 517 + 4 + 2 + 141 = 666.

It is not a de Polignac number, because 251742141 - 2⁵ = 251742109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251742143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665796 + ... + 666173.

It is an arithmetic number, because the mean of its divisors is an integer number (26639400).

Almost surely, 2^251742141 is an apocalyptic number.

251742141 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251742141 is a deficient number, since it is larger than the sum of its proper divisors (174488259).

251742141 is a wasteful number, since it uses less digits than its factorization.

251742141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331985 (or 1331979 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 251742141 is about 15866.3839925800. The cubic root of 251742141 is about 631.4204457421.

Adding to 251742141 its reverse (141247152), we get a palindrome (392989293).

The spelling of 251742141 in words is "two hundred fifty-one million, seven hundred forty-two thousand, one hundred forty-one".