1630790257 has 2 divisors, whose sum is σ = 1630790258. Its totient is φ = 1630790256.

The previous prime is 1630790219. The next prime is 1630790261. The reversal of 1630790257 is 7520970361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1526933776 + 103856481 = 39076^2 + 10191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630790257 is a prime.

It is a super-2 number, since 2×1630790257² = 5318953724652252098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1630794257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815395128 + 815395129.

It is an arithmetic number, because the mean of its divisors is an integer number (815395129).

Almost surely, 2^1630790257 is an apocalyptic number.

It is an amenable number.

1630790257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630790257 is an equidigital number, since it uses as much as digits as its factorization.

1630790257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 1630790257 is about 40383.0441769810. The cubic root of 1630790257 is about 1177.0620816164.

The spelling of 1630790257 in words is "one billion, six hundred thirty million, seven hundred ninety thousand, two hundred fifty-seven".