671158 has 4 divisors (see below), whose sum is σ = 1006740. Its totient is φ = 335578.

The previous prime is 671141. The next prime is 671159. The reversal of 671158 is 851176.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671159) by changing a digit.

671158 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167788 + ... + 167791.

It is an arithmetic number, because the mean of its divisors is an integer number (251685).

2⁶⁷¹¹⁵⁸ is an apocalyptic number.

671158 is a deficient number, since it is larger than the sum of its proper divisors (335582).

671158 is a wasteful number, since it uses less digits than its factorization.

671158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335581.

The product of its digits is 1680, while the sum is 28.

The square root of 671158 is about 819.2423328906. The cubic root of 671158 is about 87.5537846199.

It can be divided in two parts, 67 and 1158, that added together give a triangular number (1225 = T₄₉).

The spelling of 671158 in words is "six hundred seventy-one thousand, one hundred fifty-eight".