2156507 has 2 divisors, whose sum is σ = 2156508. Its totient is φ = 2156506.

The previous prime is 2156491. The next prime is 2156521. The reversal of 2156507 is 7056512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156507 - 2⁴ = 2156491 is a prime.

It is a super-3 number, since 3×2156507³ = 30086652593337767529, which contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2156537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078253 + 1078254.

It is an arithmetic number, because the mean of its divisors is an integer number (1078254).

2^2156507 is an apocalyptic number.

2156507 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156507 is an equidigital number, since it uses as much as digits as its factorization.

2156507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 2156507 is about 1468.5050221228. The cubic root of 2156507 is about 129.1963638042.

The spelling of 2156507 in words is "two million, one hundred fifty-six thousand, five hundred seven".