319561 has 12 divisors (see below), whose sum is σ = 372400. Its totient is φ = 273240.

The previous prime is 319547. The next prime is 319567. The reversal of 319561 is 165913.

It is not a de Polignac number, because 319561 - 2⁷ = 319433 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

319561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (319567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2230 + ... + 2368.

2³¹⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

319561 is a deficient number, since it is larger than the sum of its proper divisors (52839).

319561 is a wasteful number, since it uses less digits than its factorization.

319561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 169 counting only the distinct ones).

The product of its digits is 810, while the sum is 25.

The square root of 319561 is about 565.2972669313. The cubic root of 319561 is about 68.3677452428.

The spelling of 319561 in words is "three hundred nineteen thousand, five hundred sixty-one".