319898991 has 8 divisors (see below), whose sum is σ = 448981120. Its totient is φ = 202041432.

The previous prime is 319898989. The next prime is 319898993. The reversal of 319898991 is 199898913.

It is an interprime number because it is at equal distance from previous prime (319898989) and next prime (319898993).

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

It is not a de Polignac number, because 319898991 - 2¹ = 319898989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 5612263 = 319898991 / (3 + 1 + 9 + 8 + 9 + 8 + 9 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319898993) 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, 2806075 + ... + 2806188.

It is an arithmetic number, because the mean of its divisors is an integer number (56122640).

Almost surely, 2^319898991 is an apocalyptic number.

319898991 is a deficient number, since it is larger than the sum of its proper divisors (129082129).

319898991 is a wasteful number, since it uses less digits than its factorization.

319898991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612285.

The product of its digits is 1259712, while the sum is 57.

The square root of 319898991 is about 17885.7203097890. The cubic root of 319898991 is about 683.9184031969.

The spelling of 319898991 in words is "three hundred nineteen million, eight hundred ninety-eight thousand, nine hundred ninety-one".