22145477 has 2 divisors, whose sum is σ = 22145478. Its totient is φ = 22145476.

The previous prime is 22145471. The next prime is 22145503. The reversal of 22145477 is 77454122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 2307361 = 4454^2 + 1519^2 .

It is a cyclic number.

It is not a de Polignac number, because 22145477 - 2¹⁰ = 22144453 is a prime.

It is equal to p_1397831 and since 22145477 and 1397831 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 (22145471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11072738 + 11072739.

It is an arithmetic number, because the mean of its divisors is an integer number (11072739).

Almost surely, 2^22145477 is an apocalyptic number.

It is an amenable number.

22145477 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145477 is an equidigital number, since it uses as much as digits as its factorization.

22145477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 32.

The square root of 22145477 is about 4705.8981076942. The cubic root of 22145477 is about 280.8202013386.

Adding to 22145477 its reverse (77454122), we get a palindrome (99599599).

It can be divided in two parts, 22145 and 477, that added together give a palindrome (22622).

The spelling of 22145477 in words is "twenty-two million, one hundred forty-five thousand, four hundred seventy-seven".