1601731603 has 4 divisors (see below), whose sum is σ = 1631953008. Its totient is φ = 1571510200.

The previous prime is 1601731601. The next prime is 1601731627. The reversal of 1601731603 is 3061371061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061371061 = 7 ⋅437338723.

It is a cyclic number.

It is not a de Polignac number, because 1601731603 - 2¹ = 1601731601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601731601) 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, 15110623 + ... + 15110728.

It is an arithmetic number, because the mean of its divisors is an integer number (407988252).

Almost surely, 2^1601731603 is an apocalyptic number.

1601731603 is a deficient number, since it is larger than the sum of its proper divisors (30221405).

1601731603 is an equidigital number, since it uses as much as digits as its factorization.

1601731603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30221404.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1601731603 is about 40021.6391843213. The cubic root of 1601731603 is about 1170.0288796534.

The spelling of 1601731603 in words is "one billion, six hundred one million, seven hundred thirty-one thousand, six hundred three".