12001657 has 4 divisors (see below), whose sum is σ = 12010240. Its totient is φ = 11993076.

The previous prime is 12001571. The next prime is 12001667. The reversal of 12001657 is 75610021.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12001657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653 + ... + 5170.

It is an arithmetic number, because the mean of its divisors is an integer number (3002560).

Almost surely, 2^12001657 is an apocalyptic number.

It is an amenable number.

12001657 is a deficient number, since it is larger than the sum of its proper divisors (8583).

12001657 is an equidigital number, since it uses as much as digits as its factorization.

12001657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 12001657 is about 3464.3407742311. The cubic root of 12001657 is about 228.9533857562.

Adding to 12001657 its reverse (75610021), we get a palindrome (87611678).

The spelling of 12001657 in words is "twelve million, one thousand, six hundred fifty-seven".