22540251 has 8 divisors (see below), whose sum is σ = 31635520. Its totient is φ = 14235912.

The previous prime is 22540237. The next prime is 22540319. The reversal of 22540251 is 15204522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22540251 - 2¹⁰ = 22539227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22540451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197665 + ... + 197778.

It is an arithmetic number, because the mean of its divisors is an integer number (3954440).

Almost surely, 2^22540251 is an apocalyptic number.

22540251 is a deficient number, since it is larger than the sum of its proper divisors (9095269).

22540251 is a wasteful number, since it uses less digits than its factorization.

22540251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395465.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22540251 is about 4747.6574223505. The cubic root of 22540251 is about 282.4790534499.

Adding to 22540251 its reverse (15204522), we get a palindrome (37744773).

It can be divided in two parts, 22540 and 251, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 22540251 in words is "twenty-two million, five hundred forty thousand, two hundred fifty-one".