1290931 has 4 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 1285864.

The previous prime is 1290923. The next prime is 1290937. The reversal of 1290931 is 1390921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1290931 - 2³ = 1290923 is a prime.

It is a super-2 number, since 2×1290931² = 3333005693522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290896 and 1290905.

It is not an unprimeable number, because it can be changed into a prime (1290937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131 + ... + 2668.

It is an arithmetic number, because the mean of its divisors is an integer number (324000).

2^1290931 is an apocalyptic number.

1290931 is a deficient number, since it is larger than the sum of its proper divisors (5069).

1290931 is an equidigital number, since it uses as much as digits as its factorization.

1290931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1290931 is about 1136.1914451359. The cubic root of 1290931 is about 108.8849050249.

The spelling of 1290931 in words is "one million, two hundred ninety thousand, nine hundred thirty-one".