1290631 has 2 divisors, whose sum is σ = 1290632. Its totient is φ = 1290630.

The previous prime is 1290629. The next prime is 1290637. The reversal of 1290631 is 1360921.

It is a weak prime.

It is an emirp because it is prime and its reverse (1360921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1290631 - 2¹ = 1290629 is a prime.

It is a super-2 number, since 2×1290631² = 3331456756322, which contains 22 as substring.

Together with 1290629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290637) 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, 645315 + 645316.

It is an arithmetic number, because the mean of its divisors is an integer number (645316).

2^1290631 is an apocalyptic number.

1290631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290631 is an equidigital number, since it uses as much as digits as its factorization.

1290631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1290631 is about 1136.0594174602. The cubic root of 1290631 is about 108.8764697685.

The spelling of 1290631 in words is "one million, two hundred ninety thousand, six hundred thirty-one".