31609316443 has 2 divisors, whose sum is σ = 31609316444. Its totient is φ = 31609316442.

The previous prime is 31609316419. The next prime is 31609316489. The reversal of 31609316443 is 34461390613.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31609316443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31609316396 and 31609316405.

It is not a weakly prime, because it can be changed into another prime (31609316143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804658221 + 15804658222.

It is an arithmetic number, because the mean of its divisors is an integer number (15804658222).

Almost surely, 2^31609316443 is an apocalyptic number.

31609316443 is a deficient number, since it is larger than the sum of its proper divisors (1).

31609316443 is an equidigital number, since it uses as much as digits as its factorization.

31609316443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 31609316443 in words is "thirty-one billion, six hundred nine million, three hundred sixteen thousand, four hundred forty-three".