981255624 has 128 divisors (see below), whose sum is σ = 2647572480. Its totient is φ = 302297600.

The previous prime is 981255563. The next prime is 981255641. The reversal of 981255624 is 426552189.

It is a Cunningham number, because it is equal to 31325²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4322599 + ... + 4322825.

It is an arithmetic number, because the mean of its divisors is an integer number (20684160).

Almost surely, 2^981255624 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 981255624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323786240).

981255624 is an abundant number, since it is smaller than the sum of its proper divisors (1666316856).

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

981255624 is a wasteful number, since it uses less digits than its factorization.

981255624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 487 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 981255624 is about 31324.9999840383. Note that the first 4 decimals coincide. The cubic root of 981255624 is about 993.7124239105.

The spelling of 981255624 in words is "nine hundred eighty-one million, two hundred fifty-five thousand, six hundred twenty-four".