2191016 has 16 divisors (see below), whose sum is σ = 4149600. Its totient is φ = 1084464.

The previous prime is 2191001. The next prime is 2191019. The reversal of 2191016 is 6101912.

It is a super-2 number, since 2×2191016² = 9601102224512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2191019) 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, 506 + ... + 2153.

It is an arithmetic number, because the mean of its divisors is an integer number (259350).

2^2191016 is an apocalyptic number.

It is an amenable number.

2191016 is a deficient number, since it is larger than the sum of its proper divisors (1958584).

2191016 is a wasteful number, since it uses less digits than its factorization.

2191016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2764 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 2191016 is about 1480.2080934788. The cubic root of 2191016 is about 129.8818650663.

Adding to 2191016 its reverse (6101912), we get a palindrome (8292928).

The spelling of 2191016 in words is "two million, one hundred ninety-one thousand, sixteen".