72510173 has 2 divisors, whose sum is σ = 72510174. Its totient is φ = 72510172.

The previous prime is 72510157. The next prime is 72510257. The reversal of 72510173 is 37101527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45657049 + 26853124 = 6757^2 + 5182^2 .

It is a cyclic number.

It is not a de Polignac number, because 72510173 - 2⁴ = 72510157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72510133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36255086 + 36255087.

It is an arithmetic number, because the mean of its divisors is an integer number (36255087).

Almost surely, 2^72510173 is an apocalyptic number.

It is an amenable number.

72510173 is a deficient number, since it is larger than the sum of its proper divisors (1).

72510173 is an equidigital number, since it uses as much as digits as its factorization.

72510173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 72510173 is about 8515.2905411383. The cubic root of 72510173 is about 416.9970479043.

The spelling of 72510173 in words is "seventy-two million, five hundred ten thousand, one hundred seventy-three".