671732091 has 12 divisors (see below), whose sum is σ = 970519680. Its totient is φ = 447710640.

The previous prime is 671732063. The next prime is 671732129. The reversal of 671732091 is 190237176.

It is a happy number.

It is not a de Polignac number, because 671732091 - 2⁵ = 671732059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671732041) 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, 47590 + ... + 60068.

It is an arithmetic number, because the mean of its divisors is an integer number (80876640).

Almost surely, 2^671732091 is an apocalyptic number.

671732091 is a deficient number, since it is larger than the sum of its proper divisors (298787589).

671732091 is a wasteful number, since it uses less digits than its factorization.

671732091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18466 (or 18463 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 671732091 is about 25917.7948714778. The cubic root of 671732091 is about 875.7874124467.

The spelling of 671732091 in words is "six hundred seventy-one million, seven hundred thirty-two thousand, ninety-one".