977825531 has 4 divisors (see below), whose sum is σ = 983228064. Its totient is φ = 972423000.

The previous prime is 977825507. The next prime is 977825543. The reversal of 977825531 is 135528779.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-977825531 is a prime.

It is a super-2 number, since 2×977825531² = 1912285538150863922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977825551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2700995 + ... + 2701356.

It is an arithmetic number, because the mean of its divisors is an integer number (245807016).

Almost surely, 2^977825531 is an apocalyptic number.

977825531 is a deficient number, since it is larger than the sum of its proper divisors (5402533).

977825531 is a wasteful number, since it uses less digits than its factorization.

977825531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402532.

The product of its digits is 529200, while the sum is 47.

The square root of 977825531 is about 31270.2019660891. The cubic root of 977825531 is about 992.5531930537.

The spelling of 977825531 in words is "nine hundred seventy-seven million, eight hundred twenty-five thousand, five hundred thirty-one".