2591012581 has 4 divisors (see below), whose sum is σ = 2674593664. Its totient is φ = 2507431500.

The previous prime is 2591012563. The next prime is 2591012591. The reversal of 2591012581 is 1852101952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2591012581 - 2⁵ = 2591012549 is a prime.

It is a super-2 number, since 2×2591012581² = 13426692389800563122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591012591) 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, 41790495 + ... + 41790556.

It is an arithmetic number, because the mean of its divisors is an integer number (668648416).

Almost surely, 2^2591012581 is an apocalyptic number.

It is an amenable number.

2591012581 is a deficient number, since it is larger than the sum of its proper divisors (83581083).

2591012581 is an equidigital number, since it uses as much as digits as its factorization.

2591012581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83581082.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 2591012581 is about 50901.9899512779. The cubic root of 2591012581 is about 1373.4826379539.

The spelling of 2591012581 in words is "two billion, five hundred ninety-one million, twelve thousand, five hundred eighty-one".