2149197697 has 4 divisors (see below), whose sum is σ = 2149399876. Its totient is φ = 2148995520.

The previous prime is 2149197683. The next prime is 2149197707. The reversal of 2149197697 is 7967919412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1495832976 + 653364721 = 38676^2 + 25561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149197697 - 2²³ = 2140809089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2149197497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84204 + ... + 106717.

It is an arithmetic number, because the mean of its divisors is an integer number (537349969).

Almost surely, 2^2149197697 is an apocalyptic number.

It is an amenable number.

2149197697 is a deficient number, since it is larger than the sum of its proper divisors (202179).

2149197697 is a wasteful number, since it uses less digits than its factorization.

2149197697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202178.

The product of its digits is 1714608, while the sum is 55.

The square root of 2149197697 is about 46359.4402144806. The cubic root of 2149197697 is about 1290.5023176458.

The spelling of 2149197697 in words is "two billion, one hundred forty-nine million, one hundred ninety-seven thousand, six hundred ninety-seven".