72015169 has 2 divisors, whose sum is σ = 72015170. Its totient is φ = 72015168.

The previous prime is 72015137. The next prime is 72015191. The reversal of 72015169 is 96151027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63680400 + 8334769 = 7980^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 72015169 - 2⁵ = 72015137 is a prime.

It is a super-2 number, since 2×72015169² = 10372369132197122, 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 72015169.

It is not a weakly prime, because it can be changed into another prime (72015569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36007584 + 36007585.

It is an arithmetic number, because the mean of its divisors is an integer number (36007585).

Almost surely, 2^72015169 is an apocalyptic number.

It is an amenable number.

72015169 is a deficient number, since it is larger than the sum of its proper divisors (1).

72015169 is an equidigital number, since it uses as much as digits as its factorization.

72015169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 72015169 is about 8486.1751690617. The cubic root of 72015169 is about 416.0459781066.

The spelling of 72015169 in words is "seventy-two million, fifteen thousand, one hundred sixty-nine".