8197931377 has 4 divisors (see below), whose sum is σ = 8554363200. Its totient is φ = 7841499556.

The previous prime is 8197931327. The next prime is 8197931393. The reversal of 8197931377 is 7731397918.

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: 7731397918 = 2 ⋅3865698959.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8197931377 is a prime.

It is a super-2 number, since 2×8197931377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8197931327) 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, 178215877 + ... + 178215922.

It is an arithmetic number, because the mean of its divisors is an integer number (2138590800).

Almost surely, 2^8197931377 is an apocalyptic number.

It is an amenable number.

8197931377 is a deficient number, since it is larger than the sum of its proper divisors (356431823).

8197931377 is a wasteful number, since it uses less digits than its factorization.

8197931377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356431822.

The product of its digits is 2000376, while the sum is 55.

The square root of 8197931377 is about 90542.4286011812. The cubic root of 8197931377 is about 2016.3600902387.

The spelling of 8197931377 in words is "eight billion, one hundred ninety-seven million, nine hundred thirty-one thousand, three hundred seventy-seven".