72621139 has 2 divisors, whose sum is σ = 72621140. Its totient is φ = 72621138.

The previous prime is 72621089. The next prime is 72621151. The reversal of 72621139 is 93112627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72621139 - 2⁷ = 72621011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72621139.

It is not a weakly prime, because it can be changed into another prime (72621169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36310569 + 36310570.

It is an arithmetic number, because the mean of its divisors is an integer number (36310570).

Almost surely, 2^72621139 is an apocalyptic number.

72621139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72621139 is an equidigital number, since it uses as much as digits as its factorization.

72621139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 72621139 is about 8521.8037409929. The cubic root of 72621139 is about 417.2096567387.

The spelling of 72621139 in words is "seventy-two million, six hundred twenty-one thousand, one hundred thirty-nine".