16055581 has 4 divisors (see below), whose sum is σ = 16070464. Its totient is φ = 16040700.

The previous prime is 16055573. The next prime is 16055593. The reversal of 16055581 is 18555061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16055581 - 2³ = 16055573 is a prime.

It is a super-2 number, since 2×16055581² = 515563362495122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16055681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5685 + ... + 8026.

It is an arithmetic number, because the mean of its divisors is an integer number (4017616).

Almost surely, 2^16055581 is an apocalyptic number.

It is an amenable number.

16055581 is a deficient number, since it is larger than the sum of its proper divisors (14883).

16055581 is a wasteful number, since it uses less digits than its factorization.

16055581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14882.

The product of its (nonzero) digits is 6000, while the sum is 31.

The square root of 16055581 is about 4006.9416017706. The cubic root of 16055581 is about 252.2756547304.

The spelling of 16055581 in words is "sixteen million, fifty-five thousand, five hundred eighty-one".