72309091 has 2 divisors, whose sum is σ = 72309092. Its totient is φ = 72309090.

The previous prime is 72309073. The next prime is 72309103. The reversal of 72309091 is 19090327.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72309091 - 2⁵ = 72309059 is a prime.

It is not a weakly prime, because it can be changed into another prime (72309001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36154545 + 36154546.

It is an arithmetic number, because the mean of its divisors is an integer number (36154546).

Almost surely, 2^72309091 is an apocalyptic number.

72309091 is a deficient number, since it is larger than the sum of its proper divisors (1).

72309091 is an equidigital number, since it uses as much as digits as its factorization.

72309091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 72309091 is about 8503.4752307512. The cubic root of 72309091 is about 416.6112251211.

The spelling of 72309091 in words is "seventy-two million, three hundred nine thousand, ninety-one".