2155579 has 2 divisors, whose sum is σ = 2155580. Its totient is φ = 2155578.

The previous prime is 2155519. The next prime is 2155597. The reversal of 2155579 is 9755512.

Together with next prime (2155597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2155579 - 2⁷ = 2155451 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077789 + 1077790.

It is an arithmetic number, because the mean of its divisors is an integer number (1077790).

2^2155579 is an apocalyptic number.

2155579 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155579 is an equidigital number, since it uses as much as digits as its factorization.

2155579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15750, while the sum is 34.

The square root of 2155579 is about 1468.1890205284. The cubic root of 2155579 is about 129.1778289810.

The spelling of 2155579 in words is "two million, one hundred fifty-five thousand, five hundred seventy-nine".