72622591 has 2 divisors, whose sum is σ = 72622592. Its totient is φ = 72622590.

The previous prime is 72622559. The next prime is 72622621. The reversal of 72622591 is 19522627.

It is a strong prime.

It is an emirp because it is prime and its reverse (19522627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72622591 - 2⁵ = 72622559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72662591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36311295 + 36311296.

It is an arithmetic number, because the mean of its divisors is an integer number (36311296).

Almost surely, 2^72622591 is an apocalyptic number.

72622591 is a deficient number, since it is larger than the sum of its proper divisors (1).

72622591 is an equidigital number, since it uses as much as digits as its factorization.

72622591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 72622591 is about 8521.8889337987. Note that the first 3 decimals coincide. The cubic root of 72622591 is about 417.2124373082.

The spelling of 72622591 in words is "seventy-two million, six hundred twenty-two thousand, five hundred ninety-one".