22405251 has 16 divisors (see below), whose sum is σ = 32780160. Its totient is φ = 13499520.

The previous prime is 22405249. The next prime is 22405261. The reversal of 22405251 is 15250422.

It is a happy number.

It is not a de Polignac number, because 22405251 - 2¹ = 22405249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22405231) 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 15 ways as a sum of consecutive naturals, for example, 4011 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (2048760).

Almost surely, 2^22405251 is an apocalyptic number.

22405251 is a deficient number, since it is larger than the sum of its proper divisors (10374909).

22405251 is a wasteful number, since it uses less digits than its factorization.

22405251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986.

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

The square root of 22405251 is about 4733.4185320971. The cubic root of 22405251 is about 281.9139745650.

Adding to 22405251 its reverse (15250422), we get a palindrome (37655673).

The spelling of 22405251 in words is "twenty-two million, four hundred five thousand, two hundred fifty-one".