2156617 has 2 divisors, whose sum is σ = 2156618. Its totient is φ = 2156616.

The previous prime is 2156599. The next prime is 2156629. The reversal of 2156617 is 7166512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1585081 + 571536 = 1259^2 + 756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156617 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078308 + 1078309.

It is an arithmetic number, because the mean of its divisors is an integer number (1078309).

2^2156617 is an apocalyptic number.

It is an amenable number.

2156617 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156617 is an equidigital number, since it uses as much as digits as its factorization.

2156617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 2156617 is about 1468.5424747007. The cubic root of 2156617 is about 129.1985604673.

The spelling of 2156617 in words is "two million, one hundred fifty-six thousand, six hundred seventeen".