2691491 has 16 divisors (see below), whose sum is σ = 3201120. Its totient is φ = 2234880.

The previous prime is 2691467. The next prime is 2691517. The reversal of 2691491 is 1941962.

It is a cyclic number.

It is not a de Polignac number, because 2691491 - 2⁶ = 2691427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2691401) 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, 6725 + ... + 7113.

It is an arithmetic number, because the mean of its divisors is an integer number (200070).

2^2691491 is an apocalyptic number.

2691491 is a deficient number, since it is larger than the sum of its proper divisors (509629).

2691491 is a wasteful number, since it uses less digits than its factorization.

2691491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454.

The product of its digits is 3888, while the sum is 32.

The square root of 2691491 is about 1640.5764230904. The cubic root of 2691491 is about 139.1012322612.

The spelling of 2691491 in words is "two million, six hundred ninety-one thousand, four hundred ninety-one".