2191515 has 16 divisors (see below), whose sum is σ = 3529248. Its totient is φ = 1161216.

The previous prime is 2191513. The next prime is 2191523. The reversal of 2191515 is 5151912.

It is not a de Polignac number, because 2191515 - 2¹ = 2191513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2191513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2517 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (220578).

2^2191515 is an apocalyptic number.

2191515 is a deficient number, since it is larger than the sum of its proper divisors (1337733).

2191515 is a wasteful number, since it uses less digits than its factorization.

2191515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958.

The product of its digits is 450, while the sum is 24.

The square root of 2191515 is about 1480.3766412640. The cubic root of 2191515 is about 129.8917244392.

The spelling of 2191515 in words is "two million, one hundred ninety-one thousand, five hundred fifteen".