1608140137 has 4 divisors (see below), whose sum is σ = 1615042260. Its totient is φ = 1601238016.

The previous prime is 1608140123. The next prime is 1608140153. The reversal of 1608140137 is 7310418061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7310418061 = 2753 ⋅2655437.

It can be written as a sum of positive squares in 2 ways, for example, as 398561296 + 1209578841 = 19964^2 + 34779^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608140137 - 2¹¹ = 1608138089 is a prime.

It is a super-2 number, since 2×1608140137² = 5172229400460757538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1608140099 and 1608140108.

It is not an unprimeable number, because it can be changed into a prime (1608144137) 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, 3450712 + ... + 3451177.

It is an arithmetic number, because the mean of its divisors is an integer number (403760565).

Almost surely, 2^1608140137 is an apocalyptic number.

It is an amenable number.

1608140137 is a deficient number, since it is larger than the sum of its proper divisors (6902123).

1608140137 is an equidigital number, since it uses as much as digits as its factorization.

1608140137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902122.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1608140137 is about 40101.6226230311. The cubic root of 1608140137 is about 1171.5872331134.

Adding to 1608140137 its reverse (7310418061), we get a palindrome (8918558198).

The spelling of 1608140137 in words is "one billion, six hundred eight million, one hundred forty thousand, one hundred thirty-seven".