1397117931 has 8 divisors (see below), whose sum is σ = 2032171584. Its totient is φ = 846738120.

The previous prime is 1397117879. The next prime is 1397117941.

1397117931 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397117931 - 2¹¹ = 1397115883 is a prime.

It is a super-2 number, since 2×1397117931² = 3903877026243441522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1397117941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21168421 + ... + 21168486.

It is an arithmetic number, because the mean of its divisors is an integer number (254021448).

Almost surely, 2^1397117931 is an apocalyptic number.

1397117931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1397117931 is a deficient number, since it is larger than the sum of its proper divisors (635053653).

1397117931 is a wasteful number, since it uses less digits than its factorization.

1397117931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42336921.

The product of its digits is 35721, while the sum is 42.

The square root of 1397117931 is about 37378.0407592479. The cubic root of 1397117931 is about 1117.9207626336.

The spelling of 1397117931 in words is "one billion, three hundred ninety-seven million, one hundred seventeen thousand, nine hundred thirty-one".