977291657 has 4 divisors (see below), whose sum is σ = 1028728080. Its totient is φ = 925855236.

The previous prime is 977291639. The next prime is 977291713. The reversal of 977291657 is 756192779.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756192779 = 449 ⋅1684171.

It is a cyclic number.

It is not a de Polignac number, because 977291657 - 2¹⁶ = 977226121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 977291599 and 977291608.

It is not an unprimeable number, because it can be changed into a prime (977293657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25718183 + ... + 25718220.

It is an arithmetic number, because the mean of its divisors is an integer number (257182020).

Almost surely, 2^977291657 is an apocalyptic number.

It is an amenable number.

977291657 is a deficient number, since it is larger than the sum of its proper divisors (51436423).

977291657 is a wasteful number, since it uses less digits than its factorization.

977291657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51436422.

The product of its digits is 1666980, while the sum is 53.

The square root of 977291657 is about 31261.6643350926. The cubic root of 977291657 is about 992.3725218283.

The spelling of 977291657 in words is "nine hundred seventy-seven million, two hundred ninety-one thousand, six hundred fifty-seven".