22815851 has 4 divisors (see below), whose sum is σ = 22831704. Its totient is φ = 22800000.

The previous prime is 22815841. The next prime is 22815857. The reversal of 22815851 is 15851822.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22815851 - 2¹⁴ = 22799467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22815857) 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, 5525 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (5707926).

Almost surely, 2^22815851 is an apocalyptic number.

22815851 is a deficient number, since it is larger than the sum of its proper divisors (15853).

22815851 is a wasteful number, since it uses less digits than its factorization.

22815851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852.

The product of its digits is 6400, while the sum is 32.

The square root of 22815851 is about 4776.5940794671. The cubic root of 22815851 is about 283.6256847065.

The spelling of 22815851 in words is "twenty-two million, eight hundred fifteen thousand, eight hundred fifty-one".