251042136 has 32 divisors (see below), whose sum is σ = 660638400. Its totient is φ = 79276320.

The previous prime is 251042081. The next prime is 251042137. The reversal of 251042136 is 631240152.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251042137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274810 + ... + 275721.

It is an arithmetic number, because the mean of its divisors is an integer number (20644950).

Almost surely, 2^251042136 is an apocalyptic number.

It is an amenable number.

251042136 is an abundant number, since it is smaller than the sum of its proper divisors (409596264).

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

251042136 is a wasteful number, since it uses less digits than its factorization.

251042136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550559 (or 550555 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 251042136 is about 15844.3092623188. The cubic root of 251042136 is about 630.8346508483.

Adding to 251042136 its reverse (631240152), we get a palindrome (882282288).

The spelling of 251042136 in words is "two hundred fifty-one million, forty-two thousand, one hundred thirty-six".