1625420257 has 2 divisors, whose sum is σ = 1625420258. Its totient is φ = 1625420256.

The previous prime is 1625420239. The next prime is 1625420273. The reversal of 1625420257 is 7520245261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625379856 + 40401 = 40316^2 + 201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1625420257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625420287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812710128 + 812710129.

It is an arithmetic number, because the mean of its divisors is an integer number (812710129).

Almost surely, 2^1625420257 is an apocalyptic number.

It is an amenable number.

1625420257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625420257 is an equidigital number, since it uses as much as digits as its factorization.

1625420257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 1625420257 is about 40316.5010510585. The cubic root of 1625420257 is about 1175.7686853668.

The spelling of 1625420257 in words is "one billion, six hundred twenty-five million, four hundred twenty thousand, two hundred fifty-seven".