22405961 has 2 divisors, whose sum is σ = 22405962. Its totient is φ = 22405960.

The previous prime is 22405937. The next prime is 22405973. The reversal of 22405961 is 16950422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 6405961 = 4000^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 22405961 - 2⁶ = 22405897 is a prime.

It is not a weakly prime, because it can be changed into another prime (22405991) 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, 11202980 + 11202981.

It is an arithmetic number, because the mean of its divisors is an integer number (11202981).

Almost surely, 2^22405961 is an apocalyptic number.

It is an amenable number.

22405961 is a deficient number, since it is larger than the sum of its proper divisors (1).

22405961 is an equidigital number, since it uses as much as digits as its factorization.

22405961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 22405961 is about 4733.4935301530. The cubic root of 22405961 is about 281.9169523909.

The spelling of 22405961 in words is "twenty-two million, four hundred five thousand, nine hundred sixty-one".