22138951 has 4 divisors (see below), whose sum is σ = 22150512. Its totient is φ = 22127392.

The previous prime is 22138943. The next prime is 22138957. The reversal of 22138951 is 15983122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22138951 - 2³ = 22138943 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22138957) 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, 2146 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (5537628).

Almost surely, 2^22138951 is an apocalyptic number.

22138951 is a deficient number, since it is larger than the sum of its proper divisors (11561).

22138951 is an equidigital number, since it uses as much as digits as its factorization.

22138951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11560.

The product of its digits is 4320, while the sum is 31.

The square root of 22138951 is about 4705.2046714250. The cubic root of 22138951 is about 280.7926138741.

The spelling of 22138951 in words is "twenty-two million, one hundred thirty-eight thousand, nine hundred fifty-one".