73212157 has 2 divisors, whose sum is σ = 73212158. Its totient is φ = 73212156.

The previous prime is 73212143. The next prime is 73212163. The reversal of 73212157 is 75121237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 9036036 = 8011^2 + 3006^2 .

It is a cyclic number.

It is not a de Polignac number, because 73212157 - 2¹⁵ = 73179389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36606078 + 36606079.

It is an arithmetic number, because the mean of its divisors is an integer number (36606079).

Almost surely, 2^73212157 is an apocalyptic number.

It is an amenable number.

73212157 is a deficient number, since it is larger than the sum of its proper divisors (1).

73212157 is an equidigital number, since it uses as much as digits as its factorization.

73212157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2940, while the sum is 28.

The square root of 73212157 is about 8556.4102870304. The cubic root of 73212157 is about 418.3384029621.

The spelling of 73212157 in words is "seventy-three million, two hundred twelve thousand, one hundred fifty-seven".