22742381 has 2 divisors, whose sum is σ = 22742382. Its totient is φ = 22742380.

The previous prime is 22742371. The next prime is 22742387. The reversal of 22742381 is 18324722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 10666756 = 3475^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 22742381 - 2¹⁰ = 22741357 is a prime.

It is a super-2 number, since 2×22742381² = 1034431787098322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22742387) 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, 11371190 + 11371191.

It is an arithmetic number, because the mean of its divisors is an integer number (11371191).

Almost surely, 2^22742381 is an apocalyptic number.

It is an amenable number.

22742381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22742381 is an equidigital number, since it uses as much as digits as its factorization.

22742381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 22742381 is about 4768.8972519860. The cubic root of 22742381 is about 283.3209201790.

The spelling of 22742381 in words is "twenty-two million, seven hundred forty-two thousand, three hundred eighty-one".