31033112261 has 2 divisors, whose sum is σ = 31033112262. Its totient is φ = 31033112260.

The previous prime is 31033112219. The next prime is 31033112267. The reversal of 31033112261 is 16221133013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25737784900 + 5295327361 = 160430^2 + 72769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31033112261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31033112267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15516556130 + 15516556131.

It is an arithmetic number, because the mean of its divisors is an integer number (15516556131).

Almost surely, 2^31033112261 is an apocalyptic number.

It is an amenable number.

31033112261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31033112261 is an equidigital number, since it uses as much as digits as its factorization.

31033112261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31033112261 its reverse (16221133013), we get a palindrome (47254245274).

The spelling of 31033112261 in words is "thirty-one billion, thirty-three million, one hundred twelve thousand, two hundred sixty-one".