31422643 has 4 divisors (see below), whose sum is σ = 35911600. Its totient is φ = 26933688.

The previous prime is 31422641. The next prime is 31422659. The reversal of 31422643 is 34622413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31422643 - 2¹ = 31422641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31422641) 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 in 3 ways as a sum of consecutive naturals, for example, 2244468 + ... + 2244481.

It is an arithmetic number, because the mean of its divisors is an integer number (8977900).

Almost surely, 2^31422643 is an apocalyptic number.

31422643 is a deficient number, since it is larger than the sum of its proper divisors (4488957).

31422643 is an equidigital number, since it uses as much as digits as its factorization.

31422643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4488956.

The product of its digits is 3456, while the sum is 25.

The square root of 31422643 is about 5605.5903346570. The cubic root of 31422643 is about 315.5592417070.

The spelling of 31422643 in words is "thirty-one million, four hundred twenty-two thousand, six hundred forty-three".