319421891 has 8 divisors (see below), whose sum is σ = 340876800. Its totient is φ = 298263168.

The previous prime is 319421819. The next prime is 319421899. The reversal of 319421891 is 198124913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-319421891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319421899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71816 + ... + 76133.

It is an arithmetic number, because the mean of its divisors is an integer number (42609600).

Almost surely, 2^319421891 is an apocalyptic number.

319421891 is a deficient number, since it is larger than the sum of its proper divisors (21454909).

319421891 is a wasteful number, since it uses less digits than its factorization.

319421891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148093.

The product of its digits is 15552, while the sum is 38.

The square root of 319421891 is about 17872.3778776077. The cubic root of 319421891 is about 683.5782335099.

It can be divided in two parts, 31942 and 1891, that added together give a palindrome (33833).

The spelling of 319421891 in words is "three hundred nineteen million, four hundred twenty-one thousand, eight hundred ninety-one".