31977443 has 2 divisors, whose sum is σ = 31977444. Its totient is φ = 31977442.

The previous prime is 31977409. The next prime is 31977487. The reversal of 31977443 is 34477913.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31977443 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31977397 and 31977406.

It is not a weakly prime, because it can be changed into another prime (31977403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15988721 + 15988722.

It is an arithmetic number, because the mean of its divisors is an integer number (15988722).

Almost surely, 2^31977443 is an apocalyptic number.

31977443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31977443 is an equidigital number, since it uses as much as digits as its factorization.

31977443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 38.

The square root of 31977443 is about 5654.8601220543. The cubic root of 31977443 is about 317.4055949304.

The spelling of 31977443 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred forty-three".