491212560 has 40 divisors (see below), whose sum is σ = 1522759680. Its totient is φ = 130989952.

The previous prime is 491212543. The next prime is 491212571. The reversal of 491212560 is 65212194.

It is a tau number, because it is divible by the number of its divisors (40).

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, 1023120 + ... + 1023599.

It is an arithmetic number, because the mean of its divisors is an integer number (38068992).

Almost surely, 2^491212560 is an apocalyptic number.

491212560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491212560 is an abundant number, since it is smaller than the sum of its proper divisors (1031547120).

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

491212560 is a wasteful number, since it uses less digits than its factorization.

491212560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046735 (or 2046729 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 491212560 is about 22163.3156364295. The cubic root of 491212560 is about 789.0232868805.

It can be divided in two parts, 49121 and 2560, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 491212560 in words is "four hundred ninety-one million, two hundred twelve thousand, five hundred sixty".