491139460 has 24 divisors (see below), whose sum is σ = 1178735040. Its totient is φ = 168390624.

The previous prime is 491139457. The next prime is 491139461. The reversal of 491139460 is 64931194.

It is not an unprimeable number, because it can be changed into a prime (491139461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1753930 + ... + 1754209.

It is an arithmetic number, because the mean of its divisors is an integer number (49113960).

Almost surely, 2^491139460 is an apocalyptic number.

It is an amenable number.

491139460 is an abundant number, since it is smaller than the sum of its proper divisors (687595580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491139460 is a wasteful number, since it uses less digits than its factorization.

491139460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508155 (or 3508153 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 491139460 is about 22161.6664535860. Note that the first 3 decimals coincide. The cubic root of 491139460 is about 788.9841453300.

The spelling of 491139460 in words is "four hundred ninety-one million, one hundred thirty-nine thousand, four hundred sixty".