163601891 has 4 divisors (see below), whose sum is σ = 163627512. Its totient is φ = 163576272.

The previous prime is 163601857. The next prime is 163601917. The reversal of 163601891 is 198106361.

163601891 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 163601891 - 2¹⁰ = 163600867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163601791) 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, 5351 + ... + 18863.

It is an arithmetic number, because the mean of its divisors is an integer number (40906878).

Almost surely, 2^163601891 is an apocalyptic number.

163601891 is a deficient number, since it is larger than the sum of its proper divisors (25621).

163601891 is a wasteful number, since it uses less digits than its factorization.

163601891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25620.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 163601891 is about 12790.6954853909. The cubic root of 163601891 is about 546.9270958633.

The spelling of 163601891 in words is "one hundred sixty-three million, six hundred one thousand, eight hundred ninety-one".