1915115 has 4 divisors (see below), whose sum is σ = 2298144. Its totient is φ = 1532088.

The previous prime is 1915103. The next prime is 1915117. The reversal of 1915115 is 5115191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5115191 = 1597 ⋅3203.

It is a cyclic number.

It is not a de Polignac number, because 1915115 - 2⁴ = 1915099 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1915117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191507 + ... + 191516.

It is an arithmetic number, because the mean of its divisors is an integer number (574536).

2^1915115 is an apocalyptic number.

1915115 is a deficient number, since it is larger than the sum of its proper divisors (383029).

1915115 is an equidigital number, since it uses as much as digits as its factorization.

1915115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383028.

The product of its digits is 225, while the sum is 23.

The square root of 1915115 is about 1383.8768008750. The cubic root of 1915115 is about 124.1838021685.

The spelling of 1915115 in words is "one million, nine hundred fifteen thousand, one hundred fifteen".