73157309 has 2 divisors, whose sum is σ = 73157310. Its totient is φ = 73157308.

The previous prime is 73157299. The next prime is 73157311. The reversal of 73157309 is 90375137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 1162084 = 8485^2 + 1078^2 .

It is a cyclic number.

It is not a de Polignac number, because 73157309 - 2¹⁶ = 73091773 is a prime.

Together with 73157311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73157339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36578654 + 36578655.

It is an arithmetic number, because the mean of its divisors is an integer number (36578655).

Almost surely, 2^73157309 is an apocalyptic number.

It is an amenable number.

73157309 is a deficient number, since it is larger than the sum of its proper divisors (1).

73157309 is an equidigital number, since it uses as much as digits as its factorization.

73157309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19845, while the sum is 35.

The square root of 73157309 is about 8553.2046041235. The cubic root of 73157309 is about 418.2339086727.

The spelling of 73157309 in words is "seventy-three million, one hundred fifty-seven thousand, three hundred nine".