491139 has 24 divisors (see below), whose sum is σ = 799344. Its totient is φ = 290400.

The previous prime is 491137. The next prime is 491149. The reversal of 491139 is 931194.

It is not a de Polignac number, because 491139 - 2¹ = 491137 is a prime.

491139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (491137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11959 + ... + 11999.

It is an arithmetic number, because the mean of its divisors is an integer number (33306).

2⁴⁹¹¹³⁹ is an apocalyptic number.

491139 is a deficient number, since it is larger than the sum of its proper divisors (308205).

491139 is a wasteful number, since it uses less digits than its factorization.

491139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 55 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 491139 is about 700.8130991926. The cubic root of 491139 is about 78.8983899010.

It can be divided in two parts, 4911 and 39, that added together give a triangular number (4950 = T₉₉).

The spelling of 491139 in words is "four hundred ninety-one thousand, one hundred thirty-nine".