72185715131 has 2 divisors, whose sum is σ = 72185715132. Its totient is φ = 72185715130.

The previous prime is 72185715079. The next prime is 72185715179. The reversal of 72185715131 is 13151758127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72185715131 - 2⁶ = 72185715067 is a prime.

It is a super-2 number, since 2×72185715131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72185715331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36092857565 + 36092857566.

It is an arithmetic number, because the mean of its divisors is an integer number (36092857566).

Almost surely, 2^72185715131 is an apocalyptic number.

72185715131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72185715131 is an equidigital number, since it uses as much as digits as its factorization.

72185715131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 41.

The spelling of 72185715131 in words is "seventy-two billion, one hundred eighty-five million, seven hundred fifteen thousand, one hundred thirty-one".