72310309 has 2 divisors, whose sum is σ = 72310310. Its totient is φ = 72310308.

The previous prime is 72310267. The next prime is 72310331. The reversal of 72310309 is 90301327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63250209 + 9060100 = 7953^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 72310309 - 2¹¹ = 72308261 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72310379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36155154 + 36155155.

It is an arithmetic number, because the mean of its divisors is an integer number (36155155).

Almost surely, 2^72310309 is an apocalyptic number.

It is an amenable number.

72310309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72310309 is an equidigital number, since it uses as much as digits as its factorization.

72310309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 72310309 is about 8503.5468482275. The cubic root of 72310309 is about 416.6135642904.

The spelling of 72310309 in words is "seventy-two million, three hundred ten thousand, three hundred nine".