2690581 has 2 divisors, whose sum is σ = 2690582. Its totient is φ = 2690580.

The previous prime is 2690579. The next prime is 2690587. The reversal of 2690581 is 1850962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2430481 + 260100 = 1559^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2690581 - 2¹ = 2690579 is a prime.

It is a super-2 number, since 2×2690581² = 14478452235122, which contains 22 as substring.

Together with 2690579, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2690587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345290 + 1345291.

It is an arithmetic number, because the mean of its divisors is an integer number (1345291).

2^2690581 is an apocalyptic number.

It is an amenable number.

2690581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2690581 is an equidigital number, since it uses as much as digits as its factorization.

2690581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2690581 is about 1640.2990580989. The cubic root of 2690581 is about 139.0855536665.

The spelling of 2690581 in words is "two million, six hundred ninety thousand, five hundred eighty-one".