22451081 has 2 divisors, whose sum is σ = 22451082. Its totient is φ = 22451080.

The previous prime is 22451071. The next prime is 22451087. The reversal of 22451081 is 18015422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 511225 = 4684^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22451081 is a prime.

It is a super-2 number, since 2×22451081² = 1008102076137122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1415741 and since 22451081 and 1415741 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 (22451087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11225540 + 11225541.

It is an arithmetic number, because the mean of its divisors is an integer number (11225541).

Almost surely, 2^22451081 is an apocalyptic number.

It is an amenable number.

22451081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22451081 is an equidigital number, since it uses as much as digits as its factorization.

22451081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 22451081 is about 4738.2571690443. The cubic root of 22451081 is about 282.1060622453.

The spelling of 22451081 in words is "twenty-two million, four hundred fifty-one thousand, eighty-one".