22551551 has 4 divisors (see below), whose sum is σ = 24601704. Its totient is φ = 20501400.

The previous prime is 22551533. The next prime is 22551559. The reversal of 22551551 is 15515522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22551551 - 2¹⁰ = 22550527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22551551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22551559) 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, 1025060 + ... + 1025081.

It is an arithmetic number, because the mean of its divisors is an integer number (6150426).

Almost surely, 2^22551551 is an apocalyptic number.

22551551 is a deficient number, since it is larger than the sum of its proper divisors (2050153).

22551551 is a wasteful number, since it uses less digits than its factorization.

22551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050152.

The product of its digits is 2500, while the sum is 26.

The square root of 22551551 is about 4748.8473338274. The cubic root of 22551551 is about 282.5262502038.

The spelling of 22551551 in words is "twenty-two million, five hundred fifty-one thousand, five hundred fifty-one".