22451551 has 4 divisors (see below), whose sum is σ = 22462504. Its totient is φ = 22440600.

The previous prime is 22451503. The next prime is 22451567. The reversal of 22451551 is 15515422.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22451551 - 2¹⁵ = 22418783 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22451851) 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, 1380 + ... + 6841.

It is an arithmetic number, because the mean of its divisors is an integer number (5615626).

Almost surely, 2^22451551 is an apocalyptic number.

22451551 is a deficient number, since it is larger than the sum of its proper divisors (10953).

22451551 is an equidigital number, since it uses as much as digits as its factorization.

22451551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952.

The product of its digits is 2000, while the sum is 25.

The square root of 22451551 is about 4738.3067650797. The cubic root of 22451551 is about 282.1080308056.

Adding to 22451551 its reverse (15515422), we get a palindrome (37966973).

The spelling of 22451551 in words is "twenty-two million, four hundred fifty-one thousand, five hundred fifty-one".