2142031261 has 2 divisors, whose sum is σ = 2142031262. Its totient is φ = 2142031260.

The previous prime is 2142031237. The next prime is 2142031319. The reversal of 2142031261 is 1621302412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1706516100 + 435515161 = 41310^2 + 20869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2142031261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142031061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071015630 + 1071015631.

It is an arithmetic number, because the mean of its divisors is an integer number (1071015631).

Almost surely, 2^2142031261 is an apocalyptic number.

It is an amenable number.

2142031261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142031261 is an equidigital number, since it uses as much as digits as its factorization.

2142031261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2142031261 is about 46282.0835853357. The cubic root of 2142031261 is about 1289.0663398138.

Adding to 2142031261 its reverse (1621302412), we get a palindrome (3763333673).

The spelling of 2142031261 in words is "two billion, one hundred forty-two million, thirty-one thousand, two hundred sixty-one".