315979 has 4 divisors (see below), whose sum is σ = 334584. Its totient is φ = 297376.

The previous prime is 315977. The next prime is 316003. The reversal of 315979 is 979513.

315979 = T₂₂ + T₂₃ + ... + T₁₂₃.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979513 = 797 ⋅1229.

It is a cyclic number.

It is not a de Polignac number, because 315979 - 2¹ = 315977 is a prime.

It is a Duffinian number.

315979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (315977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9277 + ... + 9310.

It is an arithmetic number, because the mean of its divisors is an integer number (83646).

2³¹⁵⁹⁷⁹ is an apocalyptic number.

315979 is a deficient number, since it is larger than the sum of its proper divisors (18605).

315979 is a wasteful number, since it uses less digits than its factorization.

315979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18604.

The product of its digits is 8505, while the sum is 34.

The square root of 315979 is about 562.1200939301. The cubic root of 315979 is about 68.1113372146. Note that the first 3 decimals are identical.

The spelling of 315979 in words is "three hundred fifteen thousand, nine hundred seventy-nine".