251901232 has 20 divisors (see below), whose sum is σ = 532427976. Its totient is φ = 114500480.

The previous prime is 251901227. The next prime is 251901233. The reversal of 251901232 is 232109152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 251901197 and 251901206.

It is not an unprimeable number, because it can be changed into a prime (251901233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715453 + ... + 715804.

Almost surely, 2^251901232 is an apocalyptic number.

251901232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

251901232 is an abundant number, since it is smaller than the sum of its proper divisors (280526744).

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

251901232 is a wasteful number, since it uses less digits than its factorization.

251901232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431276 (or 1431270 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 251901232 is about 15871.3966619198. The cubic root of 251901232 is about 631.5534285849.

The spelling of 251901232 in words is "two hundred fifty-one million, nine hundred one thousand, two hundred thirty-two".