251220152 has 32 divisors (see below), whose sum is σ = 505789920. Its totient is φ = 116551680.

The previous prime is 251220133. The next prime is 251220157. The reversal of 251220152 is 251022152.

It is a happy number.

It is a super-2 number, since 2×251220152² = 126223129541806208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251220157) 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, 3353 + ... + 22664.

It is an arithmetic number, because the mean of its divisors is an integer number (15805935).

Almost surely, 2^251220152 is an apocalyptic number.

It is an amenable number.

251220152 is an abundant number, since it is smaller than the sum of its proper divisors (254569768).

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

251220152 is a wasteful number, since it uses less digits than its factorization.

251220152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26111 (or 26107 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 251220152 is about 15849.9259304263. The cubic root of 251220152 is about 630.9837255939.

The spelling of 251220152 in words is "two hundred fifty-one million, two hundred twenty thousand, one hundred fifty-two".