3138845257 has 2 divisors, whose sum is σ = 3138845258. Its totient is φ = 3138845256.

The previous prime is 3138845249. The next prime is 3138845261. The reversal of 3138845257 is 7525488313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2853269056 + 285576201 = 53416^2 + 16899^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138845257 - 2³ = 3138845249 is a prime.

It is not a weakly prime, because it can be changed into another prime (3138845207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569422628 + 1569422629.

It is an arithmetic number, because the mean of its divisors is an integer number (1569422629).

Almost surely, 2^3138845257 is an apocalyptic number.

It is an amenable number.

3138845257 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138845257 is an equidigital number, since it uses as much as digits as its factorization.

3138845257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 46.

The square root of 3138845257 is about 56025.3983207616. The cubic root of 3138845257 is about 1464.1648230389.

The spelling of 3138845257 in words is "three billion, one hundred thirty-eight million, eight hundred forty-five thousand, two hundred fifty-seven".