16122581 has 2 divisors, whose sum is σ = 16122582. Its totient is φ = 16122580.

The previous prime is 16122577. The next prime is 16122599. The reversal of 16122581 is 18522161.

16122581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 448900 = 3959^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 16122581 - 2² = 16122577 is a prime.

It is a super-2 number, since 2×16122581² = 519875236203122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1038482 and since 16122581 and 1038482 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16122581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16122541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8061290 + 8061291.

It is an arithmetic number, because the mean of its divisors is an integer number (8061291).

Almost surely, 2^16122581 is an apocalyptic number.

It is an amenable number.

16122581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16122581 is an equidigital number, since it uses as much as digits as its factorization.

16122581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 16122581 is about 4015.2933890315. The cubic root of 16122581 is about 252.6260834872.

The spelling of 16122581 in words is "sixteen million, one hundred twenty-two thousand, five hundred eighty-one".