22740161 has 2 divisors, whose sum is σ = 22740162. Its totient is φ = 22740160.

The previous prime is 22740149. The next prime is 22740167. The reversal of 22740161 is 16104722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 8300161 = 3800^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 22740161 - 2¹⁴ = 22723777 is a prime.

It is a super-2 number, since 2×22740161² = 1034229844611842, which contains 22 as substring.

It is equal to p_1432904 and since 22740161 and 1432904 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22740167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11370080 + 11370081.

It is an arithmetic number, because the mean of its divisors is an integer number (11370081).

Almost surely, 2^22740161 is an apocalyptic number.

It is an amenable number.

22740161 is a deficient number, since it is larger than the sum of its proper divisors (1).

22740161 is an equidigital number, since it uses as much as digits as its factorization.

22740161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 22740161 is about 4768.6644880931. The cubic root of 22740161 is about 283.3117010782.

Adding to 22740161 its reverse (16104722), we get a palindrome (38844883).

The spelling of 22740161 in words is "twenty-two million, seven hundred forty thousand, one hundred sixty-one".