1915145 has 4 divisors (see below), whose sum is σ = 2298180. Its totient is φ = 1532112.

The previous prime is 1915117. The next prime is 1915153. The reversal of 1915145 is 5415191.

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 937024 + 978121 = 968^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915145 - 2⁸ = 1914889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191510 + ... + 191519.

It is an arithmetic number, because the mean of its divisors is an integer number (574545).

2^1915145 is an apocalyptic number.

It is an amenable number.

1915145 is a deficient number, since it is larger than the sum of its proper divisors (383035).

1915145 is an equidigital number, since it uses as much as digits as its factorization.

1915145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383034.

The product of its digits is 900, while the sum is 26.

The square root of 1915145 is about 1383.8876399477. The cubic root of 1915145 is about 124.1844506055.

The spelling of 1915145 in words is "one million, nine hundred fifteen thousand, one hundred forty-five".