491651874 has 24 divisors (see below), whose sum is σ = 1217424000. Its totient is φ = 140471928.

The previous prime is 491651837. The next prime is 491651879. The reversal of 491651874 is 478156194.

It is not an unprimeable number, because it can be changed into a prime (491651879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1950874 + ... + 1951125.

It is an arithmetic number, because the mean of its divisors is an integer number (50726000).

Almost surely, 2^491651874 is an apocalyptic number.

491651874 is an abundant number, since it is smaller than the sum of its proper divisors (725772126).

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

491651874 is a wasteful number, since it uses less digits than its factorization.

491651874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902014 (or 3902011 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 491651874 is about 22173.2242581001. The cubic root of 491651874 is about 789.2584367392.

The spelling of 491651874 in words is "four hundred ninety-one million, six hundred fifty-one thousand, eight hundred seventy-four".