2158697 has 2 divisors, whose sum is σ = 2158698. Its totient is φ = 2158696.

The previous prime is 2158693. The next prime is 2158699. The reversal of 2158697 is 7968512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597696 + 561001 = 1264^2 + 749^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158697 - 2² = 2158693 is a prime.

Together with 2158699, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2158697.

It is not a weakly prime, because it can be changed into another prime (2158693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079348 + 1079349.

It is an arithmetic number, because the mean of its divisors is an integer number (1079349).

2^2158697 is an apocalyptic number.

It is an amenable number.

2158697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158697 is an equidigital number, since it uses as much as digits as its factorization.

2158697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 2158697 is about 1469.2504891951. The cubic root of 2158697 is about 129.2400833179.

The spelling of 2158697 in words is "two million, one hundred fifty-eight thousand, six hundred ninety-seven".