1601643403 has 4 divisors (see below), whose sum is σ = 1638890968. Its totient is φ = 1564395840.

The previous prime is 1601643401. The next prime is 1601643409. The reversal of 1601643403 is 3043461061.

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

It is a cyclic number.

It is not a de Polignac number, because 1601643403 - 2¹ = 1601643401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601643401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18623718 + ... + 18623803.

It is an arithmetic number, because the mean of its divisors is an integer number (409722742).

Almost surely, 2^1601643403 is an apocalyptic number.

1601643403 is a deficient number, since it is larger than the sum of its proper divisors (37247565).

1601643403 is an equidigital number, since it uses as much as digits as its factorization.

1601643403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37247564.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1601643403 is about 40020.5372652592. The cubic root of 1601643403 is about 1170.0074032210.

The spelling of 1601643403 in words is "one billion, six hundred one million, six hundred forty-three thousand, four hundred three".