12091657 has 4 divisors (see below), whose sum is σ = 12728080. Its totient is φ = 11455236.

The previous prime is 12091649. The next prime is 12091687. The reversal of 12091657 is 75619021.

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 12091657 - 2³ = 12091649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12091687) 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, 318183 + ... + 318220.

It is an arithmetic number, because the mean of its divisors is an integer number (3182020).

Almost surely, 2^12091657 is an apocalyptic number.

It is an amenable number.

12091657 is a deficient number, since it is larger than the sum of its proper divisors (636423).

12091657 is an equidigital number, since it uses as much as digits as its factorization.

12091657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636422.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 12091657 is about 3477.3059974641. The cubic root of 12091657 is about 229.5242655616.

The spelling of 12091657 in words is "twelve million, ninety-one thousand, six hundred fifty-seven".