22381081 has 2 divisors, whose sum is σ = 22381082. Its totient is φ = 22381080.

The previous prime is 22381067. The next prime is 22381091. The reversal of 22381081 is 18018322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21206025 + 1175056 = 4605^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 22381081 - 2⁵ = 22381049 is a prime.

It is a super-2 number, since 2×22381081² = 1001825573457122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22381091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11190540 + 11190541.

It is an arithmetic number, because the mean of its divisors is an integer number (11190541).

Almost surely, 2^22381081 is an apocalyptic number.

It is an amenable number.

22381081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22381081 is an equidigital number, since it uses as much as digits as its factorization.

22381081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 22381081 is about 4730.8647201120. The cubic root of 22381081 is about 281.8125651168.

The spelling of 22381081 in words is "twenty-two million, three hundred eighty-one thousand, eighty-one".