22661729 has 2 divisors, whose sum is σ = 22661730. Its totient is φ = 22661728.

The previous prime is 22661711. The next prime is 22661747. The reversal of 22661729 is 92716622.

It is a balanced prime because it is at equal distance from previous prime (22661711) and next prime (22661747).

It can be written as a sum of positive squares in only one way, i.e., 14047504 + 8614225 = 3748^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 22661729 - 2¹⁶ = 22596193 is a prime.

It is a super-2 number, since 2×22661729² = 1027107922538882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22661759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11330864 + 11330865.

It is an arithmetic number, because the mean of its divisors is an integer number (11330865).

Almost surely, 2^22661729 is an apocalyptic number.

It is an amenable number.

22661729 is a deficient number, since it is larger than the sum of its proper divisors (1).

22661729 is an equidigital number, since it uses as much as digits as its factorization.

22661729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 22661729 is about 4760.4336987296. The cubic root of 22661729 is about 282.9856069461.

The spelling of 22661729 in words is "twenty-two million, six hundred sixty-one thousand, seven hundred twenty-nine".