72125531 has 2 divisors, whose sum is σ = 72125532. Its totient is φ = 72125530.

The previous prime is 72125507. The next prime is 72125551. The reversal of 72125531 is 13552127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72125531 - 2²⁶ = 5016667 is a prime.

It is a super-2 number, since 2×72125531² = 10404184444063922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72125531.

It is not a weakly prime, because it can be changed into another prime (72125551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36062765 + 36062766.

It is an arithmetic number, because the mean of its divisors is an integer number (36062766).

Almost surely, 2^72125531 is an apocalyptic number.

72125531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72125531 is an equidigital number, since it uses as much as digits as its factorization.

72125531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 26.

The square root of 72125531 is about 8492.6751380234. The cubic root of 72125531 is about 416.2583973873.

Adding to 72125531 its reverse (13552127), we get a palindrome (85677658).

The spelling of 72125531 in words is "seventy-two million, one hundred twenty-five thousand, five hundred thirty-one".