22061551 has 4 divisors (see below), whose sum is σ = 22235392. Its totient is φ = 21887712.

The previous prime is 22061513. The next prime is 22061569. The reversal of 22061551 is 15516022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15516022 = 2 ⋅7758011.

It is a cyclic number.

It is not a de Polignac number, because 22061551 - 2⁷ = 22061423 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 (22068551) 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 3 ways as a sum of consecutive naturals, for example, 86730 + ... + 86983.

It is an arithmetic number, because the mean of its divisors is an integer number (5558848).

Almost surely, 2^22061551 is an apocalyptic number.

22061551 is a deficient number, since it is larger than the sum of its proper divisors (173841).

22061551 is a wasteful number, since it uses less digits than its factorization.

22061551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173840.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 22061551 is about 4696.9725355808. The cubic root of 22061551 is about 280.4650053837.

Adding to 22061551 its reverse (15516022), we get a palindrome (37577573).

The spelling of 22061551 in words is "twenty-two million, sixty-one thousand, five hundred fifty-one".