2591881 has 4 divisors (see below), whose sum is σ = 2614932. Its totient is φ = 2568832.

The previous prime is 2591857. The next prime is 2591891. The reversal of 2591881 is 1881952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 2325625 = 516^2 + 1525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2591881 is a prime.

It is a super-2 number, since 2×2591881² = 13435694236322, 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 (2591821) 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, 11356 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (653733).

2^2591881 is an apocalyptic number.

It is an amenable number.

2591881 is a deficient number, since it is larger than the sum of its proper divisors (23051).

2591881 is a wasteful number, since it uses less digits than its factorization.

2591881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23050.

The product of its digits is 5760, while the sum is 34.

The square root of 2591881 is about 1609.9319861410. The cubic root of 2591881 is about 137.3636068984.

The spelling of 2591881 in words is "two million, five hundred ninety-one thousand, eight hundred eighty-one".