11897385431 has 4 divisors (see below), whose sum is σ = 11906001864. Its totient is φ = 11888769000.

The previous prime is 11897385413. The next prime is 11897385433. The reversal of 11897385431 is 13458379811.

It is a happy number.

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-11897385431 is a prime.

It is a super-2 number, since 2×11897385431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11897385431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11897385433) 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, 4306145 + ... + 4308906.

It is an arithmetic number, because the mean of its divisors is an integer number (2976500466).

Almost surely, 2^11897385431 is an apocalyptic number.

11897385431 is a deficient number, since it is larger than the sum of its proper divisors (8616433).

11897385431 is an equidigital number, since it uses as much as digits as its factorization.

11897385431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8616432.

The product of its digits is 725760, while the sum is 50.

The spelling of 11897385431 in words is "eleven billion, eight hundred ninety-seven million, three hundred eighty-five thousand, four hundred thirty-one".