16113581 has 8 divisors (see below), whose sum is σ = 17656704. Its totient is φ = 14583520.

The previous prime is 16113571. The next prime is 16113599. The reversal of 16113581 is 18531161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16113581 - 2¹⁴ = 16097197 is a prime.

It is a super-2 number, since 2×16113581² = 519294985287122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16113581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16113541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (2207088).

Almost surely, 2^16113581 is an apocalyptic number.

16113581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16113581 is a deficient number, since it is larger than the sum of its proper divisors (1543123).

16113581 is a wasteful number, since it uses less digits than its factorization.

16113581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6531.

The product of its digits is 720, while the sum is 26.

The square root of 16113581 is about 4014.1725174686. The cubic root of 16113581 is about 252.5790674842.

The spelling of 16113581 in words is "sixteen million, one hundred thirteen thousand, five hundred eighty-one".