2131897897 has 2 divisors, whose sum is σ = 2131897898. Its totient is φ = 2131897896.

The previous prime is 2131897891. The next prime is 2131897919. The reversal of 2131897897 is 7987981312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2055352896 + 76545001 = 45336^2 + 8749^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131897897 - 2¹¹ = 2131895849 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131897891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065948948 + 1065948949.

It is an arithmetic number, because the mean of its divisors is an integer number (1065948949).

Almost surely, 2^2131897897 is an apocalyptic number.

It is an amenable number.

2131897897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131897897 is an equidigital number, since it uses as much as digits as its factorization.

2131897897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 55.

The square root of 2131897897 is about 46172.4798662580. The cubic root of 2131897897 is about 1287.0303858289.

The spelling of 2131897897 in words is "two billion, one hundred thirty-one million, eight hundred ninety-seven thousand, eight hundred ninety-seven".