2691261 has 6 divisors (see below), whose sum is σ = 3887390. Its totient is φ = 1794168.

The previous prime is 2691251. The next prime is 2691277. The reversal of 2691261 is 1621962.

It can be written as a sum of positive squares in only one way, i.e., 1425636 + 1265625 = 1194^2 + 1125^2 .

It is not a de Polignac number, because 2691261 - 2⁶ = 2691197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149506 + ... + 149523.

2^2691261 is an apocalyptic number.

It is an amenable number.

2691261 is a deficient number, since it is larger than the sum of its proper divisors (1196129).

2691261 is a wasteful number, since it uses less digits than its factorization.

2691261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299035 (or 299032 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2691261 is about 1640.5063242792. The cubic root of 2691261 is about 139.0972698733.

The spelling of 2691261 in words is "two million, six hundred ninety-one thousand, two hundred sixty-one".