73972517 has 2 divisors, whose sum is σ = 73972518. Its totient is φ = 73972516.

The previous prime is 73972477. The next prime is 73972537. The reversal of 73972517 is 71527937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71808676 + 2163841 = 8474^2 + 1471^2 .

It is a cyclic number.

It is not a de Polignac number, because 73972517 - 2¹² = 73968421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73972537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36986258 + 36986259.

It is an arithmetic number, because the mean of its divisors is an integer number (36986259).

Almost surely, 2^73972517 is an apocalyptic number.

It is an amenable number.

73972517 is a deficient number, since it is larger than the sum of its proper divisors (1).

73972517 is an equidigital number, since it uses as much as digits as its factorization.

73972517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92610, while the sum is 41.

The square root of 73972517 is about 8600.7277017704. The cubic root of 73972517 is about 419.7816646746.

The spelling of 73972517 in words is "seventy-three million, nine hundred seventy-two thousand, five hundred seventeen".