16265581 has 2 divisors, whose sum is σ = 16265582. Its totient is φ = 16265580.

The previous prime is 16265573. The next prime is 16265591. The reversal of 16265581 is 18556261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 4473225 = 3434^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 16265581 - 2³ = 16265573 is a prime.

It is a super-2 number, since 2×16265581² = 529138250535122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16265591) 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, 8132790 + 8132791.

It is an arithmetic number, because the mean of its divisors is an integer number (8132791).

Almost surely, 2^16265581 is an apocalyptic number.

It is an amenable number.

16265581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16265581 is an equidigital number, since it uses as much as digits as its factorization.

16265581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 16265581 is about 4033.0609963153. The cubic root of 16265581 is about 253.3707791293.

The spelling of 16265581 in words is "sixteen million, two hundred sixty-five thousand, five hundred eighty-one".