9931977677 has 4 divisors (see below), whose sum is σ = 10516211676. Its totient is φ = 9347743680.

The previous prime is 9931977667. The next prime is 9931977689. The reversal of 9931977677 is 7767791399.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4066102756 + 5865874921 = 63766^2 + 76589^2 .

It is a cyclic number.

It is not a de Polignac number, because 9931977677 - 2⁴ = 9931977661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9931977607) 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, 292116974 + ... + 292117007.

It is an arithmetic number, because the mean of its divisors is an integer number (2629052919).

Almost surely, 2^9931977677 is an apocalyptic number.

It is an amenable number.

9931977677 is a deficient number, since it is larger than the sum of its proper divisors (584233999).

9931977677 is a wasteful number, since it uses less digits than its factorization.

9931977677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584233998.

The product of its digits is 31505922, while the sum is 65.

The square root of 9931977677 is about 99659.3080299076. The cubic root of 9931977677 is about 2149.5385832961.

The spelling of 9931977677 in words is "nine billion, nine hundred thirty-one million, nine hundred seventy-seven thousand, six hundred seventy-seven".