72292309 has 2 divisors, whose sum is σ = 72292310. Its totient is φ = 72292308.

The previous prime is 72292277. The next prime is 72292327. The reversal of 72292309 is 90329227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 7409284 = 8055^2 + 2722^2 .

It is a cyclic number.

It is not a de Polignac number, because 72292309 - 2⁵ = 72292277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72292349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36146154 + 36146155.

It is an arithmetic number, because the mean of its divisors is an integer number (36146155).

Almost surely, 2^72292309 is an apocalyptic number.

It is an amenable number.

72292309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72292309 is an equidigital number, since it uses as much as digits as its factorization.

72292309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 72292309 is about 8502.4884004625. The cubic root of 72292309 is about 416.5789926109.

The spelling of 72292309 in words is "seventy-two million, two hundred ninety-two thousand, three hundred nine".