2191506 has 8 divisors (see below), whose sum is σ = 4383024. Its totient is φ = 730500.

The previous prime is 2191493. The next prime is 2191507. The reversal of 2191506 is 6051912.

It is a sphenic number, since it is the product of 3 distinct primes.

2191506 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2191507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182620 + ... + 182631.

It is an arithmetic number, because the mean of its divisors is an integer number (547878).

2^2191506 is an apocalyptic number.

2191506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191506 is a wasteful number, since it uses less digits than its factorization.

2191506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365256.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2191506 is about 1480.3736014939. The cubic root of 2191506 is about 129.8915466281.

The spelling of 2191506 in words is "two million, one hundred ninety-one thousand, five hundred six".