2691691 has 4 divisors (see below), whose sum is σ = 2757384. Its totient is φ = 2626000.

The previous prime is 2691677. The next prime is 2691701. The reversal of 2691691 is 1961962.

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

It is a cyclic number.

It is not a de Polignac number, because 2691691 - 2⁵ = 2691659 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2691631) 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, 32785 + ... + 32866.

It is an arithmetic number, because the mean of its divisors is an integer number (689346).

2^2691691 is an apocalyptic number.

2691691 is a deficient number, since it is larger than the sum of its proper divisors (65693).

2691691 is an equidigital number, since it uses as much as digits as its factorization.

2691691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65692.

The product of its digits is 5832, while the sum is 34.

The square root of 2691691 is about 1640.6373761438. The cubic root of 2691691 is about 139.1046776325.

The spelling of 2691691 in words is "two million, six hundred ninety-one thousand, six hundred ninety-one".