2131392281 has 2 divisors, whose sum is σ = 2131392282. Its totient is φ = 2131392280.

The previous prime is 2131392253. The next prime is 2131392293. The reversal of 2131392281 is 1822931312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874110681 + 257281600 = 43291^2 + 16040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131392281 - 2¹⁸ = 2131130137 is a prime.

It is a super-2 number, since 2×2131392281² = 9085666111012765922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2131392181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065696140 + 1065696141.

It is an arithmetic number, because the mean of its divisors is an integer number (1065696141).

Almost surely, 2^2131392281 is an apocalyptic number.

It is an amenable number.

2131392281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131392281 is an equidigital number, since it uses as much as digits as its factorization.

2131392281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 2131392281 is about 46167.0042454565. The cubic root of 2131392281 is about 1286.9286307045.

The spelling of 2131392281 in words is "two billion, one hundred thirty-one million, three hundred ninety-two thousand, two hundred eighty-one".