31882261 has 2 divisors, whose sum is σ = 31882262. Its totient is φ = 31882260.

The previous prime is 31882237. The next prime is 31882289. The reversal of 31882261 is 16228813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 13003236 = 4345^2 + 3606^2 .

It is an emirp because it is prime and its reverse (16228813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31882261 - 2¹³ = 31874069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31882211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15941130 + 15941131.

It is an arithmetic number, because the mean of its divisors is an integer number (15941131).

Almost surely, 2^31882261 is an apocalyptic number.

It is an amenable number.

31882261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31882261 is an equidigital number, since it uses as much as digits as its factorization.

31882261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 31882261 is about 5646.4379036699. The cubic root of 31882261 is about 317.0903589268.

The spelling of 31882261 in words is "thirty-one million, eight hundred eighty-two thousand, two hundred sixty-one".