2491331 has 2 divisors, whose sum is σ = 2491332. Its totient is φ = 2491330.

The previous prime is 2491327. The next prime is 2491339. The reversal of 2491331 is 1331942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2491331 - 2² = 2491327 is a prime.

It is a super-2 number, since 2×2491331² = 12413460303122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2491297 and 2491306.

It is not a weakly prime, because it can be changed into another prime (2491339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245665 + 1245666.

It is an arithmetic number, because the mean of its divisors is an integer number (1245666).

2^2491331 is an apocalyptic number.

2491331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491331 is an equidigital number, since it uses as much as digits as its factorization.

2491331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 2491331 is about 1578.3950709502. The cubic root of 2491331 is about 135.5638239106.

The spelling of 2491331 in words is "two million, four hundred ninety-one thousand, three hundred thirty-one".