491418109 has 36 divisors (see below), whose sum is σ = 650033244. Its totient is φ = 368178048.

The previous prime is 491418101. The next prime is 491418119. The reversal of 491418109 is 901814194.

It can be written as a sum of positive squares in 2 ways, for example, as 44222500 + 447195609 = 6650^2 + 21147^2 .

It is not a de Polignac number, because 491418109 - 2³ = 491418101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491418101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 228889 + ... + 231025.

It is an arithmetic number, because the mean of its divisors is an integer number (18056479).

Almost surely, 2^491418109 is an apocalyptic number.

491418109 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

491418109 is a deficient number, since it is larger than the sum of its proper divisors (158615135).

491418109 is a wasteful number, since it uses less digits than its factorization.

491418109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 491418109 is about 22167.9522960512. The cubic root of 491418109 is about 789.1333277224.

The spelling of 491418109 in words is "four hundred ninety-one million, four hundred eighteen thousand, one hundred nine".