72521117 has 2 divisors, whose sum is σ = 72521118. Its totient is φ = 72521116.

The previous prime is 72521063. The next prime is 72521123. The reversal of 72521117 is 71112527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42172036 + 30349081 = 6494^2 + 5509^2 .

It is a cyclic number.

It is not a de Polignac number, because 72521117 - 2¹² = 72517021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72521717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260558 + 36260559.

It is an arithmetic number, because the mean of its divisors is an integer number (36260559).

Almost surely, 2^72521117 is an apocalyptic number.

It is an amenable number.

72521117 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521117 is an equidigital number, since it uses as much as digits as its factorization.

72521117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 980, while the sum is 26.

The square root of 72521117 is about 8515.9331256181. The cubic root of 72521117 is about 417.0180260463.

The spelling of 72521117 in words is "seventy-two million, five hundred twenty-one thousand, one hundred seventeen".