11958400931 has 4 divisors (see below), whose sum is σ = 11991711600. Its totient is φ = 11925090264.

The previous prime is 11958400913. The next prime is 11958400969. The reversal of 11958400931 is 13900485911.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11958400931 is a prime.

It is a super-2 number, since 2×11958400931² (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 (11958400901) 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, 16654796 + ... + 16655513.

It is an arithmetic number, because the mean of its divisors is an integer number (2997927900).

Almost surely, 2^11958400931 is an apocalyptic number.

11958400931 is a deficient number, since it is larger than the sum of its proper divisors (33310669).

11958400931 is an equidigital number, since it uses as much as digits as its factorization.

11958400931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33310668.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 11958400931 in words is "eleven billion, nine hundred fifty-eight million, four hundred thousand, nine hundred thirty-one".