22748551 has 4 divisors (see below), whose sum is σ = 25998352. Its totient is φ = 19498752.

The previous prime is 22748519. The next prime is 22748597. The reversal of 22748551 is 15584722.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15584722 = 2 ⋅7792361.

It is not a de Polignac number, because 22748551 - 2⁵ = 22748519 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 (22748651) 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, 1624890 + ... + 1624903.

It is an arithmetic number, because the mean of its divisors is an integer number (6499588).

Almost surely, 2^22748551 is an apocalyptic number.

22748551 is a deficient number, since it is larger than the sum of its proper divisors (3249801).

22748551 is an equidigital number, since it uses as much as digits as its factorization.

22748551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249800.

The product of its digits is 22400, while the sum is 34.

The square root of 22748551 is about 4769.5441081932. The cubic root of 22748551 is about 283.3465394844.

The spelling of 22748551 in words is "twenty-two million, seven hundred forty-eight thousand, five hundred fifty-one".