1115415921 has 4 divisors (see below), whose sum is σ = 1487221232. Its totient is φ = 743610612.

The previous prime is 1115415913. The next prime is 1115415941. The reversal of 1115415921 is 1295145111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1115415921 - 2³ = 1115415913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1115415911) by changing a digit.

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, 185902651 + ... + 185902656.

It is an arithmetic number, because the mean of its divisors is an integer number (371805308).

Almost surely, 2^1115415921 is an apocalyptic number.

It is an amenable number.

1115415921 is a deficient number, since it is larger than the sum of its proper divisors (371805311).

1115415921 is an equidigital number, since it uses as much as digits as its factorization.

1115415921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371805310.

The product of its digits is 1800, while the sum is 30.

The square root of 1115415921 is about 33397.8430590959. The cubic root of 1115415921 is about 1037.0800494418.

The spelling of 1115415921 in words is "one billion, one hundred fifteen million, four hundred fifteen thousand, nine hundred twenty-one".