1631257 has 2 divisors, whose sum is σ = 1631258. Its totient is φ = 1631256.

The previous prime is 1631243. The next prime is 1631261. The reversal of 1631257 is 7521361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 876096 + 755161 = 936^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631257 - 2¹¹ = 1629209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1631297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815628 + 815629.

It is an arithmetic number, because the mean of its divisors is an integer number (815629).

2^1631257 is an apocalyptic number.

It is an amenable number.

1631257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631257 is an equidigital number, since it uses as much as digits as its factorization.

1631257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 1631257 is about 1277.2067178026. The cubic root of 1631257 is about 117.7174365233.

The spelling of 1631257 in words is "one million, six hundred thirty-one thousand, two hundred fifty-seven".