2031331261 has 2 divisors, whose sum is σ = 2031331262. Its totient is φ = 2031331260.

The previous prime is 2031331231. The next prime is 2031331301. The reversal of 2031331261 is 1621331302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017227236 + 1014104025 = 31894^2 + 31845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031331261 - 2¹³ = 2031323069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031331231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015665630 + 1015665631.

It is an arithmetic number, because the mean of its divisors is an integer number (1015665631).

Almost surely, 2^2031331261 is an apocalyptic number.

It is an amenable number.

2031331261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031331261 is an equidigital number, since it uses as much as digits as its factorization.

2031331261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 2031331261 is about 45070.2924441366. The cubic root of 2031331261 is about 1266.4661428262.

Adding to 2031331261 its reverse (1621331302), we get a palindrome (3652662563).

The spelling of 2031331261 in words is "two billion, thirty-one million, three hundred thirty-one thousand, two hundred sixty-one".