22661251 has 4 divisors (see below), whose sum is σ = 23045400. Its totient is φ = 22277104.

The previous prime is 22661231. The next prime is 22661293. The reversal of 22661251 is 15216622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15216622 = 2 ⋅7608311.

It is a cyclic number.

It is not a de Polignac number, because 22661251 - 2⁹ = 22660739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22661201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191986 + ... + 192103.

It is an arithmetic number, because the mean of its divisors is an integer number (5761350).

Almost surely, 2^22661251 is an apocalyptic number.

22661251 is a deficient number, since it is larger than the sum of its proper divisors (384149).

22661251 is an equidigital number, since it uses as much as digits as its factorization.

22661251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384148.

The product of its digits is 1440, while the sum is 25.

The square root of 22661251 is about 4760.3834929552. The cubic root of 22661251 is about 282.9836172764.

Adding to 22661251 its reverse (15216622), we get a palindrome (37877873).

The spelling of 22661251 in words is "twenty-two million, six hundred sixty-one thousand, two hundred fifty-one".