810101018 has 4 divisors (see below), whose sum is σ = 1215151530. Its totient is φ = 405050508.

The previous prime is 810100981. The next prime is 810101041.

810101018 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 787756489 + 22344529 = 28067^2 + 4727^2 .

It is an alternating number because its digits alternate between even and odd.

810101018 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202525253 + ... + 202525256.

Almost surely, 2^810101018 is an apocalyptic number.

810101018 is a deficient number, since it is larger than the sum of its proper divisors (405050512).

810101018 is a wasteful number, since it uses less digits than its factorization.

810101018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405050511.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 810101018 is about 28462.2735915457. The cubic root of 810101018 is about 932.2085015844.

It can be divided in two parts, 81010 and 1018, that added together give a palindrome (82028).

The spelling of 810101018 in words is "eight hundred ten million, one hundred one thousand, eighteen".