22545551 has 4 divisors (see below), whose sum is σ = 25766352. Its totient is φ = 19324752.

The previous prime is 22545529. The next prime is 22545577. The reversal of 22545551 is 15554522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15554522 = 2 ⋅7777261.

It is a cyclic number.

It is not a de Polignac number, because 22545551 - 2¹⁰ = 22544527 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 (22545521) 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, 1610390 + ... + 1610403.

It is an arithmetic number, because the mean of its divisors is an integer number (6441588).

Almost surely, 2^22545551 is an apocalyptic number.

22545551 is a deficient number, since it is larger than the sum of its proper divisors (3220801).

22545551 is an equidigital number, since it uses as much as digits as its factorization.

22545551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220800.

The product of its digits is 10000, while the sum is 29.

The square root of 22545551 is about 4748.2155595550. The cubic root of 22545551 is about 282.5011919442.

The spelling of 22545551 in words is "twenty-two million, five hundred forty-five thousand, five hundred fifty-one".