22154557 has 4 divisors (see below), whose sum is σ = 22167360. Its totient is φ = 22141756.

The previous prime is 22154549. The next prime is 22154563. The reversal of 22154557 is 75545122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22154557 - 2³ = 22154549 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22154567) 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, 3307 + ... + 7432.

It is an arithmetic number, because the mean of its divisors is an integer number (5541840).

Almost surely, 2^22154557 is an apocalyptic number.

It is an amenable number.

22154557 is a deficient number, since it is larger than the sum of its proper divisors (12803).

22154557 is a wasteful number, since it uses less digits than its factorization.

22154557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12802.

The product of its digits is 14000, while the sum is 31.

The square root of 22154557 is about 4706.8627555942. The cubic root of 22154557 is about 280.8585763532.

Adding to 22154557 its reverse (75545122), we get a palindrome (97699679).

The spelling of 22154557 in words is "twenty-two million, one hundred fifty-four thousand, five hundred fifty-seven".