671871031 has 4 divisors (see below), whose sum is σ = 723553432. Its totient is φ = 620188632.

The previous prime is 671871023. The next prime is 671871071. The reversal of 671871031 is 130178176.

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

It is a cyclic number.

It is not a de Polignac number, because 671871031 - 2³ = 671871023 is a prime.

It is a super-2 number, since 2×671871031² = 902821364594005922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671871071) 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, 25841181 + ... + 25841206.

It is an arithmetic number, because the mean of its divisors is an integer number (180888358).

Almost surely, 2^671871031 is an apocalyptic number.

671871031 is a deficient number, since it is larger than the sum of its proper divisors (51682401).

671871031 is a wasteful number, since it uses less digits than its factorization.

671871031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51682400.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 671871031 is about 25920.4751306761. The cubic root of 671871031 is about 875.8477904437.

The spelling of 671871031 in words is "six hundred seventy-one million, eight hundred seventy-one thousand, thirty-one".