671542 has 4 divisors (see below), whose sum is σ = 1007316. Its totient is φ = 335770.

The previous prime is 671537. The next prime is 671557. The reversal of 671542 is 245176.

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

It is a congruent number.

It is an unprimeable number.

671542 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, 167884 + ... + 167887.

It is an arithmetic number, because the mean of its divisors is an integer number (251829).

2⁶⁷¹⁵⁴² is an apocalyptic number.

671542 is a deficient number, since it is larger than the sum of its proper divisors (335774).

671542 is a wasteful number, since it uses less digits than its factorization.

671542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335773.

The product of its digits is 1680, while the sum is 25.

The square root of 671542 is about 819.4766622668. The cubic root of 671542 is about 87.5704792697.

The spelling of 671542 in words is "six hundred seventy-one thousand, five hundred forty-two".