22115551 has 8 divisors (see below), whose sum is σ = 22393008. Its totient is φ = 21840000.

The previous prime is 22115549. The next prime is 22115557. The reversal of 22115551 is 15551122.

It is a happy number.

22115551 is nontrivially palindromic in base 7.

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

It is a cyclic number.

It is not a de Polignac number, because 22115551 - 2¹ = 22115549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22115557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52321 + ... + 52741.

It is an arithmetic number, because the mean of its divisors is an integer number (2799126).

Almost surely, 2^22115551 is an apocalyptic number.

22115551 is a deficient number, since it is larger than the sum of its proper divisors (277457).

22115551 is a wasteful number, since it uses less digits than its factorization.

22115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its digits is 500, while the sum is 22.

The square root of 22115551 is about 4702.7174059261. The cubic root of 22115551 is about 280.6936500845.

Adding to 22115551 its reverse (15551122), we get a palindrome (37666673).

The spelling of 22115551 in words is "twenty-two million, one hundred fifteen thousand, five hundred fifty-one".