671320731 has 8 divisors (see below), whose sum is σ = 903784960. Its totient is φ = 443201832.

The previous prime is 671320723. The next prime is 671320733. The reversal of 671320731 is 137023176.

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

It is not a de Polignac number, because 671320731 - 2³ = 671320723 is a prime.

It is a super-2 number, since 2×671320731² = 901343047740748722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671320733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085971 + ... + 1086588.

It is an arithmetic number, because the mean of its divisors is an integer number (112973120).

Almost surely, 2^671320731 is an apocalyptic number.

671320731 is a deficient number, since it is larger than the sum of its proper divisors (232464229).

671320731 is a wasteful number, since it uses less digits than its factorization.

671320731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172665.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 671320731 is about 25909.8577958274. The cubic root of 671320731 is about 875.6086023327.

The spelling of 671320731 in words is "six hundred seventy-one million, three hundred twenty thousand, seven hundred thirty-one".