11691398931 has 8 divisors (see below), whose sum is σ = 16091387904. Its totient is φ = 7542837960.

The previous prime is 11691398921. The next prime is 11691398941. The reversal of 11691398931 is 13989319611.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11691398921) and next prime (11691398941).

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

It is not a de Polignac number, because 11691398931 - 2⁶ = 11691398867 is a prime.

It is a super-2 number, since 2×11691398931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11691398921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62856891 + ... + 62857076.

It is an arithmetic number, because the mean of its divisors is an integer number (2011423488).

Almost surely, 2^11691398931 is an apocalyptic number.

11691398931 is a deficient number, since it is larger than the sum of its proper divisors (4399988973).

11691398931 is a wasteful number, since it uses less digits than its factorization.

11691398931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125714001.

The product of its digits is 314928, while the sum is 51.

The spelling of 11691398931 in words is "eleven billion, six hundred ninety-one million, three hundred ninety-eight thousand, nine hundred thirty-one".