31232443261 has 2 divisors, whose sum is σ = 31232443262. Its totient is φ = 31232443260.

The previous prime is 31232443159. The next prime is 31232443267. The reversal of 31232443261 is 16234423213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25829311225 + 5403132036 = 160715^2 + 73506^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232443261 - 2⁷ = 31232443133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31232443267) 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, 15616221630 + 15616221631.

It is an arithmetic number, because the mean of its divisors is an integer number (15616221631).

Almost surely, 2^31232443261 is an apocalyptic number.

It is an amenable number.

31232443261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232443261 is an equidigital number, since it uses as much as digits as its factorization.

31232443261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

Adding to 31232443261 its reverse (16234423213), we get a palindrome (47466866474).

The spelling of 31232443261 in words is "thirty-one billion, two hundred thirty-two million, four hundred forty-three thousand, two hundred sixty-one".