2131201081 has 2 divisors, whose sum is σ = 2131201082. Its totient is φ = 2131201080.

The previous prime is 2131200997. The next prime is 2131201117. The reversal of 2131201081 is 1801021312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2126685456 + 4515625 = 46116^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131201081 - 2¹⁵ = 2131168313 is a prime.

It is a super-2 number, since 2×2131201081² = 9084036095311137122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2131201381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065600540 + 1065600541.

It is an arithmetic number, because the mean of its divisors is an integer number (1065600541).

Almost surely, 2^2131201081 is an apocalyptic number.

It is an amenable number.

2131201081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131201081 is an equidigital number, since it uses as much as digits as its factorization.

2131201081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 2131201081 is about 46164.9334560335. The cubic root of 2131201081 is about 1286.8901475473.

Adding to 2131201081 its reverse (1801021312), we get a palindrome (3932222393).

The spelling of 2131201081 in words is "two billion, one hundred thirty-one million, two hundred one thousand, eighty-one".