671137807 has 4 divisors (see below), whose sum is σ = 694280520. Its totient is φ = 647995096.

The previous prime is 671137801. The next prime is 671137813. The reversal of 671137807 is 708731176.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (671137801) and next prime (671137813).

It is a cyclic number.

It is not a de Polignac number, because 671137807 - 2²⁷ = 536920079 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671137807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671137801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11571313 + ... + 11571370.

It is an arithmetic number, because the mean of its divisors is an integer number (173570130).

Almost surely, 2^671137807 is an apocalyptic number.

671137807 is a deficient number, since it is larger than the sum of its proper divisors (23142713).

671137807 is a wasteful number, since it uses less digits than its factorization.

671137807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23142712.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 671137807 is about 25906.3275475317. The cubic root of 671137807 is about 875.5290653987.

The spelling of 671137807 in words is "six hundred seventy-one million, one hundred thirty-seven thousand, eight hundred seven".