671931999 has 12 divisors (see below), whose sum is σ = 971026056. Its totient is φ = 447743472.

The previous prime is 671931973. The next prime is 671932007. The reversal of 671931999 is 999139176.

It is not a de Polignac number, because 671931999 - 2¹² = 671927903 is a prime.

It is a super-2 number, since 2×671931999² = 902985222560272002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671931199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3937 + ... + 36869.

It is an arithmetic number, because the mean of its divisors is an integer number (80918838).

Almost surely, 2^671931999 is an apocalyptic number.

671931999 is a deficient number, since it is larger than the sum of its proper divisors (299094057).

671931999 is a wasteful number, since it uses less digits than its factorization.

671931999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35206 (or 35203 counting only the distinct ones).

The product of its digits is 826686, while the sum is 54.

The square root of 671931999 is about 25921.6511626864. The cubic root of 671931999 is about 875.8742821713.

The spelling of 671931999 in words is "six hundred seventy-one million, nine hundred thirty-one thousand, nine hundred ninety-nine".