1290431 has 2 divisors, whose sum is σ = 1290432. Its totient is φ = 1290430.

The previous prime is 1290427. The next prime is 1290433. The reversal of 1290431 is 1340921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1290431 - 2² = 1290427 is a prime.

It is a super-2 number, since 2×1290431² = 3330424331522, which contains 22 as substring.

Together with 1290433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290433) 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, 645215 + 645216.

It is an arithmetic number, because the mean of its divisors is an integer number (645216).

2^1290431 is an apocalyptic number.

1290431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290431 is an equidigital number, since it uses as much as digits as its factorization.

1290431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1290431 is about 1135.9713904848. The cubic root of 1290431 is about 108.8708455379.

The spelling of 1290431 in words is "one million, two hundred ninety thousand, four hundred thirty-one".