1252631491 has 2 divisors, whose sum is σ = 1252631492. Its totient is φ = 1252631490.

The previous prime is 1252631473. The next prime is 1252631507. The reversal of 1252631491 is 1941362521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1252631491 - 2¹⁷ = 1252500419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1252631431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626315745 + 626315746.

It is an arithmetic number, because the mean of its divisors is an integer number (626315746).

Almost surely, 2^1252631491 is an apocalyptic number.

1252631491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252631491 is an equidigital number, since it uses as much as digits as its factorization.

1252631491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 1252631491 is about 35392.5343963950. The cubic root of 1252631491 is about 1077.9727319182.

The spelling of 1252631491 in words is "one billion, two hundred fifty-two million, six hundred thirty-one thousand, four hundred ninety-one".