12155601 has 4 divisors (see below), whose sum is σ = 16207472. Its totient is φ = 8103732.

The previous prime is 12155587. The next prime is 12155617. The reversal of 12155601 is 10655121.

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 not a de Polignac number, because 12155601 - 2⁶ = 12155537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12155641) 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, 2025931 + ... + 2025936.

It is an arithmetic number, because the mean of its divisors is an integer number (4051868).

Almost surely, 2^12155601 is an apocalyptic number.

It is an amenable number.

12155601 is a deficient number, since it is larger than the sum of its proper divisors (4051871).

12155601 is an equidigital number, since it uses as much as digits as its factorization.

12155601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4051870.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 12155601 is about 3486.4883478939. The cubic root of 12155601 is about 229.9281502100.

The spelling of 12155601 in words is "twelve million, one hundred fifty-five thousand, six hundred one".