31047223 has 2 divisors, whose sum is σ = 31047224. Its totient is φ = 31047222.

The previous prime is 31047199. The next prime is 31047271. The reversal of 31047223 is 32274013.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31047223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31047194 and 31047203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31047283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15523611 + 15523612.

It is an arithmetic number, because the mean of its divisors is an integer number (15523612).

Almost surely, 2^31047223 is an apocalyptic number.

31047223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31047223 is an equidigital number, since it uses as much as digits as its factorization.

31047223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 31047223 is about 5572.0034996400. The cubic root of 31047223 is about 314.2974955147.

The spelling of 31047223 in words is "thirty-one million, forty-seven thousand, two hundred twenty-three".