1377997317 has 12 divisors (see below), whose sum is σ = 1992124524. Its totient is φ = 917887680.

The previous prime is 1377997303. The next prime is 1377997319. The reversal of 1377997317 is 7137997731.

It can be written as a sum of positive squares in 2 ways, for example, as 1013721921 + 364275396 = 31839^2 + 19086^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1377997317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377997319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53434 + ... + 74907.

It is an arithmetic number, because the mean of its divisors is an integer number (166010377).

Almost surely, 2^1377997317 is an apocalyptic number.

It is an amenable number.

1377997317 is a deficient number, since it is larger than the sum of its proper divisors (614127207).

1377997317 is a wasteful number, since it uses less digits than its factorization.

1377997317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129540 (or 129537 counting only the distinct ones).

The product of its digits is 1750329, while the sum is 54.

The square root of 1377997317 is about 37121.3862483609. The cubic root of 1377997317 is about 1112.7974556538.

The spelling of 1377997317 in words is "one billion, three hundred seventy-seven million, nine hundred ninety-seven thousand, three hundred seventeen".