977842913 has 4 divisors (see below), whose sum is σ = 987524628. Its totient is φ = 968161200.

The previous prime is 977842897. The next prime is 977842939. The reversal of 977842913 is 319248779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319248779 = 101 ⋅3160879.

It can be written as a sum of positive squares in 2 ways, for example, as 614444944 + 363397969 = 24788^2 + 19063^2 .

It is a cyclic number.

It is not a de Polignac number, because 977842913 - 2⁴ = 977842897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977842513) 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, 4840706 + ... + 4840907.

It is an arithmetic number, because the mean of its divisors is an integer number (246881157).

Almost surely, 2^977842913 is an apocalyptic number.

It is an amenable number.

977842913 is a deficient number, since it is larger than the sum of its proper divisors (9681715).

977842913 is a wasteful number, since it uses less digits than its factorization.

977842913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9681714.

The product of its digits is 762048, while the sum is 50.

The square root of 977842913 is about 31270.4798971810. The cubic root of 977842913 is about 992.5590742860.

The spelling of 977842913 in words is "nine hundred seventy-seven million, eight hundred forty-two thousand, nine hundred thirteen".