3125816257 has 2 divisors, whose sum is σ = 3125816258. Its totient is φ = 3125816256.

The previous prime is 3125816207. The next prime is 3125816297. The reversal of 3125816257 is 7526185213.

It is an a-pointer prime, because the next prime (3125816297) can be obtained adding 3125816257 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1571012496 + 1554803761 = 39636^2 + 39431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3125816257 is a prime.

It is not a weakly prime, because it can be changed into another prime (3125816207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562908128 + 1562908129.

It is an arithmetic number, because the mean of its divisors is an integer number (1562908129).

Almost surely, 2^3125816257 is an apocalyptic number.

It is an amenable number.

3125816257 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125816257 is an equidigital number, since it uses as much as digits as its factorization.

3125816257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 3125816257 is about 55908.9997853655. Note that the first 3 decimals coincide. The cubic root of 3125816257 is about 1462.1361513554.

The spelling of 3125816257 in words is "three billion, one hundred twenty-five million, eight hundred sixteen thousand, two hundred fifty-seven".