2159897 has 2 divisors, whose sum is σ = 2159898. Its totient is φ = 2159896.

The previous prime is 2159893. The next prime is 2159903. The reversal of 2159897 is 7989512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2157961 + 1936 = 1469^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159897 - 2² = 2159893 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5⁵ + 9 + 8³ + 9⁵ + 7² .

It is not a weakly prime, because it can be changed into another prime (2159893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079948 + 1079949.

It is an arithmetic number, because the mean of its divisors is an integer number (1079949).

2^2159897 is an apocalyptic number.

It is an amenable number.

2159897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159897 is an equidigital number, since it uses as much as digits as its factorization.

2159897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 2159897 is about 1469.6588039406. The cubic root of 2159897 is about 129.2640266769.

The spelling of 2159897 in words is "two million, one hundred fifty-nine thousand, eight hundred ninety-seven".