2156567 has 4 divisors (see below), whose sum is σ = 2464656. Its totient is φ = 1848480.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156567 is 7656512.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2156537) and next prime (2156597).

It is a cyclic number.

It is not a de Polignac number, because 2156567 - 2⁸ = 2156311 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 (2156507) 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, 154034 + ... + 154047.

It is an arithmetic number, because the mean of its divisors is an integer number (616164).

2^2156567 is an apocalyptic number.

2156567 is a deficient number, since it is larger than the sum of its proper divisors (308089).

2156567 is an equidigital number, since it uses as much as digits as its factorization.

2156567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308088.

The product of its digits is 12600, while the sum is 32.

The square root of 2156567 is about 1468.5254509201. The cubic root of 2156567 is about 129.1975619933.

Subtracting 2156567 from its reverse (7656512), we obtain a palindrome (5499945).

The spelling of 2156567 in words is "two million, one hundred fifty-six thousand, five hundred sixty-seven".