491801853 has 8 divisors (see below), whose sum is σ = 661864608. Its totient is φ = 324803504.

The previous prime is 491801851. The next prime is 491801867. The reversal of 491801853 is 358108194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491801853 - 2¹ = 491801851 is a prime.

It is a super-2 number, since 2×491801853² = 483738125228467218, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491801851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765726 + ... + 766367.

It is an arithmetic number, because the mean of its divisors is an integer number (82733076).

Almost surely, 2^491801853 is an apocalyptic number.

It is an amenable number.

491801853 is a deficient number, since it is larger than the sum of its proper divisors (170062755).

491801853 is a wasteful number, since it uses less digits than its factorization.

491801853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532203.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 491801853 is about 22176.6059846858. The cubic root of 491801853 is about 789.3386833275.

The spelling of 491801853 in words is "four hundred ninety-one million, eight hundred one thousand, eight hundred fifty-three".