987731440958025 has 81 divisors (see below), whose sum is σ = 1807619391758791. Its totient is φ = 515570236229280.

The previous prime is 987731440957981. The next prime is 987731440958051. The reversal of 987731440958025 is 520859044137789.

The square root of 987731440958025 is 31428195.

It is a perfect power (a square), and thus also a powerful number.

987731440958025 is a `hidden beast` number, since 9 + 8 + 7 + 7 + 3 + 14 + 4 + 0 + 9 + 580 + 25 = 666.

987731440958025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 355583318744889 + 632148122213136 = 18856917^2 + 25142556^2 .

It is not a de Polignac number, because 987731440958025 - 2³⁷ = 987594002004553 is a prime.

It is a super-2 number, since 2×987731440958025² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 22156855186 + ... + 22156899764.

Almost surely, 2^{987731440958025} is an apocalyptic number.

987731440958025 is the 31428195-th square number.

987731440958025 is the 15714098-th centered octagonal number.

It is an amenable number.

987731440958025 is a deficient number, since it is larger than the sum of its proper divisors (819887950800766).

987731440958025 is an frugal number, since it uses more digits than its factorization.

987731440958025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89268 (or 44634 counting only the distinct ones).

The product of its (nonzero) digits is 609638400, while the sum is 72.

The spelling of 987731440958025 in words is "nine hundred eighty-seven trillion, seven hundred thirty-one billion, four hundred forty million, nine hundred fifty-eight thousand, twenty-five".