16581122 has 4 divisors (see below), whose sum is σ = 24871686. Its totient is φ = 8290560.

The previous prime is 16581119. The next prime is 16581139. The reversal of 16581122 is 22118561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 89401 = 4061^2 + 299^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16581091 and 16581100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4145279 + ... + 4145282.

Almost surely, 2^16581122 is an apocalyptic number.

16581122 is a deficient number, since it is larger than the sum of its proper divisors (8290564).

16581122 is an equidigital number, since it uses as much as digits as its factorization.

16581122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8290563.

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

The square root of 16581122 is about 4071.9923870263. The cubic root of 16581122 is about 254.9987030563.

Adding to 16581122 its reverse (22118561), we get a palindrome (38699683).

The spelling of 16581122 in words is "sixteen million, five hundred eighty-one thousand, one hundred twenty-two".