72266591 has 2 divisors, whose sum is σ = 72266592. Its totient is φ = 72266590.

The previous prime is 72266561. The next prime is 72266627. The reversal of 72266591 is 19566227.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19566227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72266591 - 2⁶ = 72266527 is a prime.

It is a super-2 number, since 2×72266591² = 10444920349522562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72266561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36133295 + 36133296.

It is an arithmetic number, because the mean of its divisors is an integer number (36133296).

Almost surely, 2^72266591 is an apocalyptic number.

72266591 is a deficient number, since it is larger than the sum of its proper divisors (1).

72266591 is an equidigital number, since it uses as much as digits as its factorization.

72266591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 72266591 is about 8500.9758851558. The cubic root of 72266591 is about 416.5295874050.

The spelling of 72266591 in words is "seventy-two million, two hundred sixty-six thousand, five hundred ninety-one".