11571955 has 4 divisors (see below), whose sum is σ = 13886352. Its totient is φ = 9257560.

The previous prime is 11571949. The next prime is 11571983. The reversal of 11571955 is 55917511.

It is a happy number.

11571955 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 an emirpimes, since its reverse is a distinct semiprime: 55917511 = 13 ⋅4301347.

It is not a de Polignac number, because 11571955 - 2²³ = 3183347 is a prime.

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 11571955.

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, 1157191 + ... + 1157200.

It is an arithmetic number, because the mean of its divisors is an integer number (3471588).

Almost surely, 2^11571955 is an apocalyptic number.

11571955 is a deficient number, since it is larger than the sum of its proper divisors (2314397).

11571955 is an equidigital number, since it uses as much as digits as its factorization.

11571955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314396.

The product of its digits is 7875, while the sum is 34.

The square root of 11571955 is about 3401.7576339298. The cubic root of 11571955 is about 226.1876622822.

The spelling of 11571955 in words is "eleven million, five hundred seventy-one thousand, nine hundred fifty-five".