2691257 has 4 divisors (see below), whose sum is σ = 2712576. Its totient is φ = 2669940.

The previous prime is 2691251. The next prime is 2691277. The reversal of 2691257 is 7521962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2691257 - 2⁶ = 2691193 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 10469 + ... + 10722.

It is an arithmetic number, because the mean of its divisors is an integer number (678144).

2^2691257 is an apocalyptic number.

It is an amenable number.

2691257 is a deficient number, since it is larger than the sum of its proper divisors (21319).

2691257 is a wasteful number, since it uses less digits than its factorization.

2691257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21318.

The product of its digits is 7560, while the sum is 32.

The square root of 2691257 is about 1640.5051051429. The cubic root of 2691257 is about 139.0972009602.

The spelling of 2691257 in words is "two million, six hundred ninety-one thousand, two hundred fifty-seven".