853749491 has 6 divisors (see below), whose sum is σ = 993137220. Its totient is φ = 731785236.

The previous prime is 853749487. The next prime is 853749509. The reversal of 853749491 is 194947358.

It is not a de Polignac number, because 853749491 - 2² = 853749487 is a prime.

It is a super-3 number, since 3×853749491³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853749461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8711681 + ... + 8711778.

It is an arithmetic number, because the mean of its divisors is an integer number (165522870).

Almost surely, 2^853749491 is an apocalyptic number.

853749491 is a deficient number, since it is larger than the sum of its proper divisors (139387729).

853749491 is a wasteful number, since it uses less digits than its factorization.

853749491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17423473 (or 17423466 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The square root of 853749491 is about 29218.9919572870. The cubic root of 853749491 is about 948.6590465989.

The spelling of 853749491 in words is "eight hundred fifty-three million, seven hundred forty-nine thousand, four hundred ninety-one".