319743643 has 2 divisors, whose sum is σ = 319743644. Its totient is φ = 319743642.

The previous prime is 319743637. The next prime is 319743659. The reversal of 319743643 is 346347913.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 319743643 - 2⁹ = 319743131 is a prime.

It is a super-2 number, since 2×319743643² = 204471994477822898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 319743596 and 319743605.

It is not a weakly prime, because it can be changed into another prime (319743673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159871821 + 159871822.

It is an arithmetic number, because the mean of its divisors is an integer number (159871822).

Almost surely, 2^319743643 is an apocalyptic number.

319743643 is a deficient number, since it is larger than the sum of its proper divisors (1).

319743643 is an equidigital number, since it uses as much as digits as its factorization.

319743643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 40.

The square root of 319743643 is about 17881.3769883642. The cubic root of 319743643 is about 683.8076780807.

The spelling of 319743643 in words is "three hundred nineteen million, seven hundred forty-three thousand, six hundred forty-three".