251155552 has 96 divisors (see below), whose sum is σ = 552593664. Its totient is φ = 111820800.

The previous prime is 251155537. The next prime is 251155559. The reversal of 251155552 is 255551152.

It is a super-2 number, since 2×251155552² = 126158222600849408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251155559) 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 15 ways as a sum of consecutive naturals, for example, 893652 + ... + 893932.

It is an arithmetic number, because the mean of its divisors is an integer number (5756184).

Almost surely, 2^251155552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251155552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276296832).

251155552 is an abundant number, since it is smaller than the sum of its proper divisors (301438112).

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

251155552 is a wasteful number, since it uses less digits than its factorization.

251155552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 384 counting only the distinct ones).

The product of its digits is 12500, while the sum is 31.

The square root of 251155552 is about 15847.8879349899. The cubic root of 251155552 is about 630.9296361924.

The spelling of 251155552 in words is "two hundred fifty-one million, one hundred fifty-five thousand, five hundred fifty-two".