2612001581 has 4 divisors (see below), whose sum is σ = 2985144672. Its totient is φ = 2238858492.

The previous prime is 2612001577. The next prime is 2612001593. The reversal of 2612001581 is 1851002162.

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 2612001581 - 2² = 2612001577 is a prime.

It is a super-2 number, since 2×2612001581² = 13645104518292999122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2612001581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2612001541) 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, 186571535 + ... + 186571548.

It is an arithmetic number, because the mean of its divisors is an integer number (746286168).

Almost surely, 2^2612001581 is an apocalyptic number.

It is an amenable number.

2612001581 is a deficient number, since it is larger than the sum of its proper divisors (373143091).

2612001581 is an equidigital number, since it uses as much as digits as its factorization.

2612001581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373143090.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 2612001581 is about 51107.7448240479. The cubic root of 2612001581 is about 1377.1813892191.

The spelling of 2612001581 in words is "two billion, six hundred twelve million, one thousand, five hundred eighty-one".