1249631 has 2 divisors, whose sum is σ = 1249632. Its totient is φ = 1249630.

The previous prime is 1249627. The next prime is 1249643. The reversal of 1249631 is 1369421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1249631 - 2² = 1249627 is a prime.

It is a super-2 number, since 2×1249631² = 3123155272322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1249631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624815 + 624816.

It is an arithmetic number, because the mean of its divisors is an integer number (624816).

2^1249631 is an apocalyptic number.

1249631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249631 is an equidigital number, since it uses as much as digits as its factorization.

1249631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 1249631 is about 1117.8689547527. The cubic root of 1249631 is about 107.7111336397.

The spelling of 1249631 in words is "one million, two hundred forty-nine thousand, six hundred thirty-one".