2155567 has 4 divisors (see below), whose sum is σ = 2161720. Its totient is φ = 2149416.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155567 is 7655512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2155567 - 2¹¹ = 2153519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155597) 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, 2517 + ... + 3262.

It is an arithmetic number, because the mean of its divisors is an integer number (540430).

2^2155567 is an apocalyptic number.

2155567 is a deficient number, since it is larger than the sum of its proper divisors (6153).

2155567 is an equidigital number, since it uses as much as digits as its factorization.

2155567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6152.

The product of its digits is 10500, while the sum is 31.

The square root of 2155567 is about 1468.1849338554. The cubic root of 2155567 is about 129.1775892717.

Subtracting 2155567 from its reverse (7655512), we obtain a palindrome (5499945).

The spelling of 2155567 in words is "two million, one hundred fifty-five thousand, five hundred sixty-seven".