631319 has 4 divisors (see below), whose sum is σ = 679896. Its totient is φ = 582744.

The previous prime is 631307. The next prime is 631339. The reversal of 631319 is 913136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631319 is a prime.

It is a super-2 number, since 2×631319² = 797127359522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631294 and 631303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631339) 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, 24269 + ... + 24294.

It is an arithmetic number, because the mean of its divisors is an integer number (169974).

2⁶³¹³¹⁹ is an apocalyptic number.

631319 is a deficient number, since it is larger than the sum of its proper divisors (48577).

631319 is a wasteful number, since it uses less digits than its factorization.

631319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48576.

The product of its digits is 486, while the sum is 23.

The square root of 631319 is about 794.5558507745. Note that the first 3 decimals coincide. The cubic root of 631319 is about 85.7859740205.

The spelling of 631319 in words is "six hundred thirty-one thousand, three hundred nineteen".