22451249 has 4 divisors (see below), whose sum is σ = 23225460. Its totient is φ = 21677040.

The previous prime is 22451213. The next prime is 22451257. The reversal of 22451249 is 94215422.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4752400 + 17698849 = 2180^2 + 4207^2 .

It is a cyclic number.

It is not a de Polignac number, because 22451249 - 2⁸ = 22450993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 774181 = 22451249 / (2 + 2 + 4 + 5 + 1 + 2 + 4 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22451269) 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, 387062 + ... + 387119.

It is an arithmetic number, because the mean of its divisors is an integer number (5806365).

Almost surely, 2^22451249 is an apocalyptic number.

22451249 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22451249 is a deficient number, since it is larger than the sum of its proper divisors (774211).

22451249 is an equidigital number, since it uses as much as digits as its factorization.

22451249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774210.

The product of its digits is 5760, while the sum is 29.

The square root of 22451249 is about 4738.2748970485. The cubic root of 22451249 is about 282.1067659041.

The spelling of 22451249 in words is "twenty-two million, four hundred fifty-one thousand, two hundred forty-nine".