16140581 has 4 divisors (see below), whose sum is σ = 16283532. Its totient is φ = 15997632.

The previous prime is 16140577. The next prime is 16140587. The reversal of 16140581 is 18504161.

16140581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1768900 + 14371681 = 1330^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 16140581 - 2² = 16140577 is a prime.

It is a super-2 number, since 2×16140581² = 521036710035122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16140581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16140587) 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, 71306 + ... + 71531.

It is an arithmetic number, because the mean of its divisors is an integer number (4070883).

Almost surely, 2^16140581 is an apocalyptic number.

It is an amenable number.

16140581 is a deficient number, since it is larger than the sum of its proper divisors (142951).

16140581 is a wasteful number, since it uses less digits than its factorization.

16140581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142950.

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

The square root of 16140581 is about 4017.5341940051. The cubic root of 16140581 is about 252.7200630282.

The spelling of 16140581 in words is "sixteen million, one hundred forty thousand, five hundred eighty-one".