12137691 has 8 divisors (see below), whose sum is σ = 16205904. Its totient is φ = 8080640.

The previous prime is 12137683. The next prime is 12137693. The reversal of 12137691 is 19673121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12137691 - 2³ = 12137683 is a prime.

It is a super-2 number, since 2×12137691² = 294647085622962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12137693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (2025738).

Almost surely, 2^12137691 is an apocalyptic number.

12137691 is a deficient number, since it is larger than the sum of its proper divisors (4068213).

12137691 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (12137690) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (5581).

12137691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581.

The product of its digits is 2268, while the sum is 30.

The square root of 12137691 is about 3483.9189140966. The cubic root of 12137691 is about 229.8151697188.

The spelling of 12137691 in words is "twelve million, one hundred thirty-seven thousand, six hundred ninety-one".