31366481 has 2 divisors, whose sum is σ = 31366482. Its totient is φ = 31366480.

The previous prime is 31366469. The next prime is 31366483. The reversal of 31366481 is 18466313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 12138256 = 4385^2 + 3484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31366481 is a prime.

It is a super-2 number, since 2×31366481² = 1967712260646722, which contains 22 as substring.

Together with 31366483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31366483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15683240 + 15683241.

It is an arithmetic number, because the mean of its divisors is an integer number (15683241).

Almost surely, 2^31366481 is an apocalyptic number.

It is an amenable number.

31366481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31366481 is an equidigital number, since it uses as much as digits as its factorization.

31366481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 31366481 is about 5600.5786308202. The cubic root of 31366481 is about 315.3711288746.

The spelling of 31366481 in words is "thirty-one million, three hundred sixty-six thousand, four hundred eighty-one".