11912555 has 4 divisors (see below), whose sum is σ = 14295072. Its totient is φ = 9530040.

The previous prime is 11912531. The next prime is 11912569. The reversal of 11912555 is 55521911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55521911 = 79 ⋅702809.

It is not a de Polignac number, because 11912555 - 2⁶ = 11912491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191251 + ... + 1191260.

It is an arithmetic number, because the mean of its divisors is an integer number (3573768).

Almost surely, 2^11912555 is an apocalyptic number.

11912555 is a deficient number, since it is larger than the sum of its proper divisors (2382517).

11912555 is an equidigital number, since it uses as much as digits as its factorization.

11912555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382516.

The product of its digits is 2250, while the sum is 29.

The square root of 11912555 is about 3451.4569387434. The cubic root of 11912555 is about 228.3853836737.

The spelling of 11912555 in words is "eleven million, nine hundred twelve thousand, five hundred fifty-five".