671393381 has 8 divisors (see below), whose sum is σ = 693391104. Its totient is φ = 649416960.

The previous prime is 671393377. The next prime is 671393407. The reversal of 671393381 is 183393176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671393381 - 2² = 671393377 is a prime.

It is a super-2 number, since 2×671393381² = 901538144101222322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671393311) 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 7 ways as a sum of consecutive naturals, for example, 81410 + ... + 89276.

It is an arithmetic number, because the mean of its divisors is an integer number (86673888).

Almost surely, 2^671393381 is an apocalyptic number.

It is an amenable number.

671393381 is a deficient number, since it is larger than the sum of its proper divisors (21997723).

671393381 is a wasteful number, since it uses less digits than its factorization.

671393381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651.

The product of its digits is 81648, while the sum is 41.

The square root of 671393381 is about 25911.2597339458. The cubic root of 671393381 is about 875.6401871711.

The spelling of 671393381 in words is "six hundred seventy-one million, three hundred ninety-three thousand, three hundred eighty-one".