671021771 has 8 divisors (see below), whose sum is σ = 768797664. Its totient is φ = 573724800.

The previous prime is 671021759. The next prime is 671021789. The reversal of 671021771 is 177120176.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671021771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671021731) 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, 116720 + ... + 122333.

It is an arithmetic number, because the mean of its divisors is an integer number (96099708).

Almost surely, 2^671021771 is an apocalyptic number.

671021771 is a deficient number, since it is larger than the sum of its proper divisors (97775893).

671021771 is a wasteful number, since it uses less digits than its factorization.

671021771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239461.

The product of its (nonzero) digits is 4116, while the sum is 32.

The square root of 671021771 is about 25904.0879206352. The cubic root of 671021771 is about 875.4786044526.

The spelling of 671021771 in words is "six hundred seventy-one million, twenty-one thousand, seven hundred seventy-one".