22131647 has 2 divisors, whose sum is σ = 22131648. Its totient is φ = 22131646.

The previous prime is 22131643. The next prime is 22131649. The reversal of 22131647 is 74613122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22131647 - 2² = 22131643 is a prime.

Together with 22131649, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1397006 and since 22131647 and 1397006 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22131643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065823 + 11065824.

It is an arithmetic number, because the mean of its divisors is an integer number (11065824).

Almost surely, 2^22131647 is an apocalyptic number.

22131647 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131647 is an equidigital number, since it uses as much as digits as its factorization.

22131647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 22131647 is about 4704.4284456244. The cubic root of 22131647 is about 280.7617311275.

Adding to 22131647 its reverse (74613122), we get a palindrome (96744769).

The spelling of 22131647 in words is "twenty-two million, one hundred thirty-one thousand, six hundred forty-seven".