1297631 has 2 divisors, whose sum is σ = 1297632. Its totient is φ = 1297630.

The previous prime is 1297619. The next prime is 1297633. The reversal of 1297631 is 1367921.

It is a strong prime.

It is an emirp because it is prime and its reverse (1367921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1297631 is a prime.

It is a super-2 number, since 2×1297631² = 3367692424322, which contains 22 as substring.

Together with 1297633, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1297594 and 1297603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648815 + 648816.

It is an arithmetic number, because the mean of its divisors is an integer number (648816).

2^1297631 is an apocalyptic number.

1297631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297631 is an equidigital number, since it uses as much as digits as its factorization.

1297631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 1297631 is about 1139.1360761560. The cubic root of 1297631 is about 109.0729528737.

The spelling of 1297631 in words is "one million, two hundred ninety-seven thousand, six hundred thirty-one".