921115105 has 4 divisors (see below), whose sum is σ = 1105338132. Its totient is φ = 736892080.

The previous prime is 921115043. The next prime is 921115123. The reversal of 921115105 is 501511129.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 611671824 + 309443281 = 24732^2 + 17591^2 .

It is a de Polignac number, because none of the positive numbers 2^k-921115105 is a prime.

It is a super-2 number, since 2×921115105² = 1696906073318322050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921115105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92111506 + ... + 92111515.

It is an arithmetic number, because the mean of its divisors is an integer number (276334533).

Almost surely, 2^921115105 is an apocalyptic number.

It is an amenable number.

921115105 is a deficient number, since it is larger than the sum of its proper divisors (184223027).

921115105 is a wasteful number, since it uses less digits than its factorization.

921115105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184223026.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 921115105 is about 30349.8781710899. The cubic root of 921115105 is about 972.9816163561.

The spelling of 921115105 in words is "nine hundred twenty-one million, one hundred fifteen thousand, one hundred five".