22148781 has 8 divisors (see below), whose sum is σ = 29553504. Its totient is φ = 14754960.

The previous prime is 22148767. The next prime is 22148801. The reversal of 22148781 is 18784122.

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 22148781 - 2⁶ = 22148717 is a prime.

It is a super-2 number, since 2×22148781² = 981136999571922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22148081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6135 + ... + 9051.

It is an arithmetic number, because the mean of its divisors is an integer number (3694188).

Almost surely, 2^22148781 is an apocalyptic number.

It is an amenable number.

22148781 is a deficient number, since it is larger than the sum of its proper divisors (7404723).

22148781 is a wasteful number, since it uses less digits than its factorization.

22148781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5451.

The product of its digits is 7168, while the sum is 33.

The square root of 22148781 is about 4706.2491434262. The cubic root of 22148781 is about 280.8341663242.

The spelling of 22148781 in words is "twenty-two million, one hundred forty-eight thousand, seven hundred eighty-one".