22661641 has 2 divisors, whose sum is σ = 22661642. Its totient is φ = 22661640.

The previous prime is 22661633. The next prime is 22661657. The reversal of 22661641 is 14616622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 2903616 = 4445^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 22661641 - 2³ = 22661633 is a prime.

It is not a weakly prime, because it can be changed into another prime (22661671) 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 as a sum of consecutive naturals, namely, 11330820 + 11330821.

It is an arithmetic number, because the mean of its divisors is an integer number (11330821).

Almost surely, 2^22661641 is an apocalyptic number.

It is an amenable number.

22661641 is a deficient number, since it is larger than the sum of its proper divisors (1).

22661641 is an equidigital number, since it uses as much as digits as its factorization.

22661641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 22661641 is about 4760.4244558653. The cubic root of 22661641 is about 282.9852406492.

The spelling of 22661641 in words is "twenty-two million, six hundred sixty-one thousand, six hundred forty-one".