72116531 has 2 divisors, whose sum is σ = 72116532. Its totient is φ = 72116530.

The previous prime is 72116519. The next prime is 72116557. The reversal of 72116531 is 13561127.

It is an a-pointer prime, because the next prime (72116557) can be obtained adding 72116531 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72116531 - 2²² = 67922227 is a prime.

It is a super-2 number, since 2×72116531² = 10401588086947922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72116531.

It is not a weakly prime, because it can be changed into another prime (72116501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36058265 + 36058266.

It is an arithmetic number, because the mean of its divisors is an integer number (36058266).

Almost surely, 2^72116531 is an apocalyptic number.

72116531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72116531 is an equidigital number, since it uses as much as digits as its factorization.

72116531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 72116531 is about 8492.1452531148. The cubic root of 72116531 is about 416.2410827538.

Adding to 72116531 its reverse (13561127), we get a palindrome (85677658).

The spelling of 72116531 in words is "seventy-two million, one hundred sixteen thousand, five hundred thirty-one".