989525987 has 16 divisors (see below), whose sum is σ = 1104155712. Its totient is φ = 881971200.

The previous prime is 989525981. The next prime is 989525989. The reversal of 989525987 is 789525989.

It is a cyclic number.

It is not a de Polignac number, because 989525987 - 2¹⁴ = 989509603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989525981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26963 + ... + 52019.

It is an arithmetic number, because the mean of its divisors is an integer number (69009732).

Almost surely, 2^989525987 is an apocalyptic number.

989525987 is a deficient number, since it is larger than the sum of its proper divisors (114629725).

989525987 is a wasteful number, since it uses less digits than its factorization.

989525987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25198.

The product of its digits is 16329600, while the sum is 62.

The square root of 989525987 is about 31456.7319822006. The cubic root of 989525987 is about 996.4964014664.

The spelling of 989525987 in words is "nine hundred eighty-nine million, five hundred twenty-five thousand, nine hundred eighty-seven".