72194168131 has 2 divisors, whose sum is σ = 72194168132. Its totient is φ = 72194168130.

The previous prime is 72194168113. The next prime is 72194168161. The reversal of 72194168131 is 13186149127.

It is a happy number.

Together with previous prime (72194168113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72194168131 - 2²⁵ = 72160613699 is a prime.

It is a super-2 number, since 2×72194168131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72194168161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36097084065 + 36097084066.

It is an arithmetic number, because the mean of its divisors is an integer number (36097084066).

Almost surely, 2^72194168131 is an apocalyptic number.

72194168131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72194168131 is an equidigital number, since it uses as much as digits as its factorization.

72194168131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The spelling of 72194168131 in words is "seventy-two billion, one hundred ninety-four million, one hundred sixty-eight thousand, one hundred thirty-one".