491135520 has 48 divisors (see below), whose sum is σ = 1547078400. Its totient is φ = 130969344.

The previous prime is 491135509. The next prime is 491135531. The reversal of 491135520 is 25531194.

It is an interprime number because it is at equal distance from previous prime (491135509) and next prime (491135531).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511120 + ... + 512079.

It is an arithmetic number, because the mean of its divisors is an integer number (32230800).

Almost surely, 2^491135520 is an apocalyptic number.

491135520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491135520 is an abundant number, since it is smaller than the sum of its proper divisors (1055942880).

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

491135520 is a wasteful number, since it uses less digits than its factorization.

491135520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023217 (or 1023209 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 491135520 is about 22161.5775611756. The cubic root of 491135520 is about 788.9820355384.

The spelling of 491135520 in words is "four hundred ninety-one million, one hundred thirty-five thousand, five hundred twenty".