810889155 has 24 divisors (see below), whose sum is σ = 1454010480. Its totient is φ = 417560640.

The previous prime is 810889147. The next prime is 810889159. The reversal of 810889155 is 551988018.

810889155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 810889155 - 2³ = 810889147 is a prime.

It is a super-2 number, since 2×810889155² = 1315082443393228050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 810889155.

It is not an unprimeable number, because it can be changed into a prime (810889159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309381 + ... + 311990.

It is an arithmetic number, because the mean of its divisors is an integer number (60583770).

Almost surely, 2^810889155 is an apocalyptic number.

810889155 is a deficient number, since it is larger than the sum of its proper divisors (643121325).

810889155 is a wasteful number, since it uses less digits than its factorization.

810889155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621411 (or 621408 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 810889155 is about 28476.1155180969. The cubic root of 810889155 is about 932.5107148728.

The spelling of 810889155 in words is "eight hundred ten million, eight hundred eighty-nine thousand, one hundred fifty-five".