12155201 has 4 divisors (see below), whose sum is σ = 12683712. Its totient is φ = 11626692.

The previous prime is 12155191. The next prime is 12155237. The reversal of 12155201 is 10255121.

12155201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 10255121 = 919 ⋅11159.

It is a cyclic number.

It is not a de Polignac number, because 12155201 - 2⁶ = 12155137 is a prime.

It is a super-2 number, since 2×12155201² = 295497822700802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12155201.

It is not an unprimeable number, because it can be changed into a prime (12155291) 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, 264221 + ... + 264266.

It is an arithmetic number, because the mean of its divisors is an integer number (3170928).

Almost surely, 2^12155201 is an apocalyptic number.

It is an amenable number.

12155201 is a deficient number, since it is larger than the sum of its proper divisors (528511).

12155201 is an equidigital number, since it uses as much as digits as its factorization.

12155201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528510.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12155201 is about 3486.4309831115. The cubic root of 12155201 is about 229.9256281279.

It can be divided in two parts, 12155 and 201, that multiplied together give a triangular number (2443155 = T₂₂₁₀).

The spelling of 12155201 in words is "twelve million, one hundred fifty-five thousand, two hundred one".