74315257 has 2 divisors, whose sum is σ = 74315258. Its totient is φ = 74315256.

The previous prime is 74315243. The next prime is 74315281. The reversal of 74315257 is 75251347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 10010896 = 8019^2 + 3164^2 .

It is an emirp because it is prime and its reverse (75251347) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74315257 is a prime.

It is not a weakly prime, because it can be changed into another prime (74315207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37157628 + 37157629.

It is an arithmetic number, because the mean of its divisors is an integer number (37157629).

Almost surely, 2^74315257 is an apocalyptic number.

It is an amenable number.

74315257 is a deficient number, since it is larger than the sum of its proper divisors (1).

74315257 is an equidigital number, since it uses as much as digits as its factorization.

74315257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 34.

The square root of 74315257 is about 8620.6297333780. The cubic root of 74315257 is about 420.4289966610.

The spelling of 74315257 in words is "seventy-four million, three hundred fifteen thousand, two hundred fifty-seven".