12251691 has 6 divisors (see below), whose sum is σ = 17696900. Its totient is φ = 8167788.

The previous prime is 12251677. The next prime is 12251719. The reversal of 12251691 is 19615221.

It is not a de Polignac number, because 12251691 - 2¹⁸ = 11989547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12251641) 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, 680641 + ... + 680658.

Almost surely, 2^12251691 is an apocalyptic number.

12251691 is a deficient number, since it is larger than the sum of its proper divisors (5445209).

12251691 is a wasteful number, since it uses less digits than its factorization.

12251691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361305 (or 1361302 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 12251691 is about 3500.2415630925. The cubic root of 12251691 is about 230.5324212547.

It can be divided in two parts, 1225 and 1691, that added together give a square (2916 = 54²).

The spelling of 12251691 in words is "twelve million, two hundred fifty-one thousand, six hundred ninety-one".