73156609 has 2 divisors, whose sum is σ = 73156610. Its totient is φ = 73156608.

The previous prime is 73156597. The next prime is 73156613. The reversal of 73156609 is 90665137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68425984 + 4730625 = 8272^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 73156609 - 2⁷ = 73156481 is a prime.

It is equal to p_4292695 and since 73156609 and 4292695 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (73156619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36578304 + 36578305.

It is an arithmetic number, because the mean of its divisors is an integer number (36578305).

Almost surely, 2^73156609 is an apocalyptic number.

It is an amenable number.

73156609 is a deficient number, since it is larger than the sum of its proper divisors (1).

73156609 is an equidigital number, since it uses as much as digits as its factorization.

73156609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 73156609 is about 8553.1636836904. The cubic root of 73156609 is about 418.2325747222.

It can be divided in two parts, 7315 and 6609, that added together give a square (13924 = 118²).

The spelling of 73156609 in words is "seventy-three million, one hundred fifty-six thousand, six hundred nine".