2691591 has 16 divisors (see below), whose sum is σ = 4164864. Its totient is φ = 1514304.

The previous prime is 2691589. The next prime is 2691599. The reversal of 2691591 is 1951962.

It is not a de Polignac number, because 2691591 - 2¹ = 2691589 is a prime.

It is a super-2 number, since 2×2691591² = 14489324222562, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (260304).

2^2691591 is an apocalyptic number.

2691591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2691591 is a deficient number, since it is larger than the sum of its proper divisors (1473273).

2691591 is a wasteful number, since it uses less digits than its factorization.

2691591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990.

The product of its digits is 4860, while the sum is 33.

The square root of 2691591 is about 1640.6068999002. The cubic root of 2691591 is about 139.1029549682.

The spelling of 2691591 in words is "two million, six hundred ninety-one thousand, five hundred ninety-one".