491171520 has 112 divisors (see below), whose sum is σ = 1782275328. Its totient is φ = 112266240.

The previous prime is 491171503. The next prime is 491171537. The reversal of 491171520 is 25171194.

It is an interprime number because it is at equal distance from previous prime (491171503) and next prime (491171537).

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×491171520² = 482498924118220800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 29826 + ... + 43265.

Almost surely, 2^491171520 is an apocalyptic number.

491171520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491171520 is an abundant number, since it is smaller than the sum of its proper divisors (1291103808).

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

491171520 is a wasteful number, since it uses less digits than its factorization.

491171520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73118 (or 73108 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 491171520 is about 22162.3897628392. The cubic root of 491171520 is about 789.0013124033.

The spelling of 491171520 in words is "four hundred ninety-one million, one hundred seventy-one thousand, five hundred twenty".