72113539 has 2 divisors, whose sum is σ = 72113540. Its totient is φ = 72113538.

The previous prime is 72113501. The next prime is 72113563. The reversal of 72113539 is 93531127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72113539 - 2⁷ = 72113411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72113539.

It is not a weakly prime, because it can be changed into another prime (72113599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36056769 + 36056770.

It is an arithmetic number, because the mean of its divisors is an integer number (36056770).

Almost surely, 2^72113539 is an apocalyptic number.

72113539 is a deficient number, since it is larger than the sum of its proper divisors (1).

72113539 is an equidigital number, since it uses as much as digits as its factorization.

72113539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 72113539 is about 8491.9690884977. The cubic root of 72113539 is about 416.2353262810.

The spelling of 72113539 in words is "seventy-two million, one hundred thirteen thousand, five hundred thirty-nine".