631919 has 4 divisors (see below), whose sum is σ = 643896. Its totient is φ = 619944.

The previous prime is 631913. The next prime is 631927. The reversal of 631919 is 919136.

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

It is a cyclic number.

It is not a de Polignac number, because 631919 - 2⁴ = 631903 is a prime.

It is a super-2 number, since 2×631919² = 798643245122, 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 = 631891 and 631900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5909 + ... + 6014.

It is an arithmetic number, because the mean of its divisors is an integer number (160974).

2⁶³¹⁹¹⁹ is an apocalyptic number.

631919 is a deficient number, since it is larger than the sum of its proper divisors (11977).

631919 is a wasteful number, since it uses less digits than its factorization.

631919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11976.

The product of its digits is 1458, while the sum is 29.

The square root of 631919 is about 794.9333305379. The cubic root of 631919 is about 85.8131421595.

The spelling of 631919 in words is "six hundred thirty-one thousand, nine hundred nineteen".