671609997 has 12 divisors (see below), whose sum is σ = 970669440. Its totient is φ = 447478728.

The previous prime is 671609989. The next prime is 671610013. The reversal of 671609997 is 799906176.

It is not a de Polignac number, because 671609997 - 2³ = 671609989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671109997) 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, 4797 + ... + 36962.

It is an arithmetic number, because the mean of its divisors is an integer number (80889120).

Almost surely, 2^671609997 is an apocalyptic number.

It is an amenable number.

671609997 is a deficient number, since it is larger than the sum of its proper divisors (299059443).

671609997 is a wasteful number, since it uses less digits than its factorization.

671609997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43552 (or 43549 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The square root of 671609997 is about 25915.4393557200. The cubic root of 671609997 is about 875.7343482024.

The spelling of 671609997 in words is "six hundred seventy-one million, six hundred nine thousand, nine hundred ninety-seven".