2156417 has 2 divisors, whose sum is σ = 2156418. Its totient is φ = 2156416.

The previous prime is 2156393. The next prime is 2156437. The reversal of 2156417 is 7146512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2119936 + 36481 = 1456^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156417 - 2¹⁰ = 2155393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2156437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078208 + 1078209.

It is an arithmetic number, because the mean of its divisors is an integer number (1078209).

2^2156417 is an apocalyptic number.

It is an amenable number.

2156417 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156417 is an equidigital number, since it uses as much as digits as its factorization.

2156417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 2156417 is about 1468.4743783941. The cubic root of 2156417 is about 129.1945664787.

The spelling of 2156417 in words is "two million, one hundred fifty-six thousand, four hundred seventeen".