74691157 has 2 divisors, whose sum is σ = 74691158. Its totient is φ = 74691156.

The previous prime is 74691137. The next prime is 74691161. The reversal of 74691157 is 75119647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60357361 + 14333796 = 7769^2 + 3786^2 .

It is an emirp because it is prime and its reverse (75119647) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74691157 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 (74691137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37345578 + 37345579.

It is an arithmetic number, because the mean of its divisors is an integer number (37345579).

Almost surely, 2^74691157 is an apocalyptic number.

It is an amenable number.

74691157 is a deficient number, since it is larger than the sum of its proper divisors (1).

74691157 is an equidigital number, since it uses as much as digits as its factorization.

74691157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 74691157 is about 8642.4045843735. The cubic root of 74691157 is about 421.1366734279.

The spelling of 74691157 in words is "seventy-four million, six hundred ninety-one thousand, one hundred fifty-seven".