491124636 has 18 divisors (see below), whose sum is σ = 1241454032. Its totient is φ = 163708200.

The previous prime is 491124607. The next prime is 491124649. The reversal of 491124636 is 636421194.

491124636 is a `hidden beast` number, since 4 + 9 + 1 + 12 + 4 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×491124636² = 482406816172264992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 13642351 = 491124636 / (4 + 9 + 1 + 1 + 2 + 4 + 6 + 3 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 491124636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6821140 + ... + 6821211.

Almost surely, 2^491124636 is an apocalyptic number.

It is an amenable number.

491124636 is an abundant number, since it is smaller than the sum of its proper divisors (750329396).

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

491124636 is a wasteful number, since it uses less digits than its factorization.

491124636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13642361 (or 13642356 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 491124636 is about 22161.3319996791. The cubic root of 491124636 is about 788.9762073141.

The spelling of 491124636 in words is "four hundred ninety-one million, one hundred twenty-four thousand, six hundred thirty-six".