2215851 has 16 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 1325120.

The previous prime is 2215847. The next prime is 2215853. The reversal of 2215851 is 1585122.

It is a cyclic number.

It is not a de Polignac number, because 2215851 - 2² = 2215847 is a prime.

2215851 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2215853) 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 15 ways as a sum of consecutive naturals, for example, 2335 + ... + 3143.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2^2215851 is an apocalyptic number.

2215851 is a deficient number, since it is larger than the sum of its proper divisors (1050069).

2215851 is a wasteful number, since it uses less digits than its factorization.

2215851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 800, while the sum is 24.

The square root of 2215851 is about 1488.5734781999. The cubic root of 2215851 is about 130.3707562046.

The spelling of 2215851 in words is "two million, two hundred fifteen thousand, eight hundred fifty-one".