491937 has 4 divisors (see below), whose sum is σ = 655920. Its totient is φ = 327956.

The previous prime is 491923. The next prime is 491951. The reversal of 491937 is 739194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (491923) and next prime (491951).

It is a cyclic number.

It is not a de Polignac number, because 491937 - 2⁶ = 491873 is a prime.

It is an Ulam number.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 491898 and 491907.

It is not an unprimeable number, because it can be changed into a prime (491977) 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, 81987 + ... + 81992.

It is an arithmetic number, because the mean of its divisors is an integer number (163980).

2⁴⁹¹⁹³⁷ is an apocalyptic number.

It is an amenable number.

491937 is a deficient number, since it is larger than the sum of its proper divisors (163983).

491937 is a wasteful number, since it uses less digits than its factorization.

491937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163982.

The product of its digits is 6804, while the sum is 33.

The square root of 491937 is about 701.3822067889. The cubic root of 491937 is about 78.9410980049.

The spelling of 491937 in words is "four hundred ninety-one thousand, nine hundred thirty-seven".