12101657 has 4 divisors (see below), whose sum is σ = 12627840. Its totient is φ = 11575476.

The previous prime is 12101647. The next prime is 12101659. The reversal of 12101657 is 75610121.

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 an emirpimes, since its reverse is a distinct semiprime: 75610121 = 379 ⋅199499.

It is a cyclic number.

It is not a de Polignac number, because 12101657 - 2⁴ = 12101641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 526159 = 12101657 / (1 + 2 + 1 + 0 + 1 + 6 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12101659) 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, 263057 + ... + 263102.

It is an arithmetic number, because the mean of its divisors is an integer number (3156960).

Almost surely, 2^12101657 is an apocalyptic number.

It is an amenable number.

12101657 is a deficient number, since it is larger than the sum of its proper divisors (526183).

12101657 is an equidigital number, since it uses as much as digits as its factorization.

12101657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526182.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 12101657 is about 3478.7435950354. The cubic root of 12101657 is about 229.5875215794.

Adding to 12101657 its reverse (75610121), we get a palindrome (87711778).

The spelling of 12101657 in words is "twelve million, one hundred one thousand, six hundred fifty-seven".