31079261 has 2 divisors, whose sum is σ = 31079262. Its totient is φ = 31079260.

The previous prime is 31079227. The next prime is 31079263. The reversal of 31079261 is 16297013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 4813636 = 5125^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 31079261 - 2⁶ = 31079197 is a prime.

It is a super-3 number, since 3×31079261³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 31079263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31079263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15539630 + 15539631.

It is an arithmetic number, because the mean of its divisors is an integer number (15539631).

Almost surely, 2^31079261 is an apocalyptic number.

It is an amenable number.

31079261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31079261 is an equidigital number, since it uses as much as digits as its factorization.

31079261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 31079261 is about 5574.8776668192. The cubic root of 31079261 is about 314.4055674620.

The spelling of 31079261 in words is "thirty-one million, seventy-nine thousand, two hundred sixty-one".