1608143581 has 16 divisors (see below), whose sum is σ = 1800601920. Its totient is φ = 1423889280.

The previous prime is 1608143561. The next prime is 1608143597. The reversal of 1608143581 is 1853418061.

It is not a de Polignac number, because 1608143581 - 2²³ = 1599754973 is a prime.

It is a super-2 number, since 2×1608143581² = 5172251554223007122, 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 1608143581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608143501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53335 + ... + 77851.

It is an arithmetic number, because the mean of its divisors is an integer number (112537620).

Almost surely, 2^1608143581 is an apocalyptic number.

1608143581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1608143581 is a deficient number, since it is larger than the sum of its proper divisors (192458339).

1608143581 is a wasteful number, since it uses less digits than its factorization.

1608143581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24684.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 1608143581 is about 40101.6655639139. The cubic root of 1608143581 is about 1171.5880694716.

The spelling of 1608143581 in words is "one billion, six hundred eight million, one hundred forty-three thousand, five hundred eighty-one".