31294643 has 2 divisors, whose sum is σ = 31294644. Its totient is φ = 31294642.

The previous prime is 31294639. The next prime is 31294649. The reversal of 31294643 is 34649213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31294643 - 2² = 31294639 is a prime.

It is not a weakly prime, because it can be changed into another prime (31294649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15647321 + 15647322.

It is an arithmetic number, because the mean of its divisors is an integer number (15647322).

Almost surely, 2^31294643 is an apocalyptic number.

31294643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31294643 is an equidigital number, since it uses as much as digits as its factorization.

31294643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 31294643 is about 5594.1615100031. The cubic root of 31294643 is about 315.1301821869.

The spelling of 31294643 in words is "thirty-one million, two hundred ninety-four thousand, six hundred forty-three".