1308731 has 2 divisors, whose sum is σ = 1308732. Its totient is φ = 1308730.

The previous prime is 1308719. The next prime is 1308737. The reversal of 1308731 is 1378031.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1378031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1308731 - 2¹⁸ = 1046587 is a prime.

It is a super-2 number, since 2×1308731² = 3425553660722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1308697 and 1308706.

It is not a weakly prime, because it can be changed into another prime (1308737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654365 + 654366.

It is an arithmetic number, because the mean of its divisors is an integer number (654366).

2^1308731 is an apocalyptic number.

1308731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1308731 is an equidigital number, since it uses as much as digits as its factorization.

1308731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1308731 is about 1143.9978146832. The cubic root of 1308731 is about 109.3830754310.

The spelling of 1308731 in words is "one million, three hundred eight thousand, seven hundred thirty-one".