491551520 has 24 divisors (see below), whose sum is σ = 1161290844. Its totient is φ = 196620544.

The previous prime is 491551483. The next prime is 491551579. The reversal of 491551520 is 25155194.

It can be written as a sum of positive squares in 2 ways, for example, as 414041104 + 77510416 = 20348^2 + 8804^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535939 + ... + 1536258.

Almost surely, 2^491551520 is an apocalyptic number.

491551520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491551520 is an abundant number, since it is smaller than the sum of its proper divisors (669739324).

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

491551520 is a wasteful number, since it uses less digits than its factorization.

491551520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072212 (or 3072204 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 491551520 is about 22170.9611880045. The cubic root of 491551520 is about 789.2047330008.

The spelling of 491551520 in words is "four hundred ninety-one million, five hundred fifty-one thousand, five hundred twenty".