671670539 has 4 divisors (see below), whose sum is σ = 707021640. Its totient is φ = 636319440.

The previous prime is 671670497. The next prime is 671670551. The reversal of 671670539 is 935076176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671670539 is a prime.

It is a super-2 number, since 2×671670539² = 902282625921101042, which contains 22 as substring.

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 671670539.

It is not an unprimeable number, because it can be changed into a prime (671670239) 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, 17675522 + ... + 17675559.

It is an arithmetic number, because the mean of its divisors is an integer number (176755410).

Almost surely, 2^671670539 is an apocalyptic number.

671670539 is a deficient number, since it is larger than the sum of its proper divisors (35351101).

671670539 is a wasteful number, since it uses less digits than its factorization.

671670539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35351100.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 671670539 is about 25916.6073975742. The cubic root of 671670539 is about 875.7606616463.

The spelling of 671670539 in words is "six hundred seventy-one million, six hundred seventy thousand, five hundred thirty-nine".