853640511 has 4 divisors (see below), whose sum is σ = 1138187352. Its totient is φ = 569093672.

The previous prime is 853640507. The next prime is 853640573. The reversal of 853640511 is 115046358.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 853640511 - 2² = 853640507 is a prime.

It is a super-2 number, since 2×853640511² = 1457404244040682242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853640581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142273416 + ... + 142273421.

It is an arithmetic number, because the mean of its divisors is an integer number (284546838).

Almost surely, 2^853640511 is an apocalyptic number.

853640511 is a deficient number, since it is larger than the sum of its proper divisors (284546841).

853640511 is a wasteful number, since it uses less digits than its factorization.

853640511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284546840.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 853640511 is about 29217.1270148179. The cubic root of 853640511 is about 948.6186798546.

Adding to 853640511 its reverse (115046358), we get a palindrome (968686869).

The spelling of 853640511 in words is "eight hundred fifty-three million, six hundred forty thousand, five hundred eleven".