22378231 has 2 divisors, whose sum is σ = 22378232. Its totient is φ = 22378230.

The previous prime is 22378217. The next prime is 22378247. The reversal of 22378231 is 13287322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22378231 - 2¹³ = 22370039 is a prime.

It is a super-2 number, since 2×22378231² = 1001570445378722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22378231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22378261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11189115 + 11189116.

It is an arithmetic number, because the mean of its divisors is an integer number (11189116).

Almost surely, 2^22378231 is an apocalyptic number.

22378231 is a deficient number, since it is larger than the sum of its proper divisors (1).

22378231 is an equidigital number, since it uses as much as digits as its factorization.

22378231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 22378231 is about 4730.5634970900. The cubic root of 22378231 is about 281.8006026338.

Subtracting from 22378231 its reverse (13287322), we obtain a palindrome (9090909).

The spelling of 22378231 in words is "twenty-two million, three hundred seventy-eight thousand, two hundred thirty-one".