1995507257 has 2 divisors, whose sum is σ = 1995507258. Its totient is φ = 1995507256.

The previous prime is 1995507229. The next prime is 1995507289. The reversal of 1995507257 is 7527055991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1068243856 + 927263401 = 32684^2 + 30451^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995507257 - 2¹⁴ = 1995490873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1995587257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997753628 + 997753629.

It is an arithmetic number, because the mean of its divisors is an integer number (997753629).

Almost surely, 2^1995507257 is an apocalyptic number.

It is an amenable number.

1995507257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995507257 is an equidigital number, since it uses as much as digits as its factorization.

1995507257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 992250, while the sum is 50.

The square root of 1995507257 is about 44671.1009154688. The cubic root of 1995507257 is about 1258.9769256774.

The spelling of 1995507257 in words is "one billion, nine hundred ninety-five million, five hundred seven thousand, two hundred fifty-seven".