163791403 has 4 divisors (see below), whose sum is σ = 164414448. Its totient is φ = 163168360.

The previous prime is 163791389. The next prime is 163791431. The reversal of 163791403 is 304197361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304197361 = 13 ⋅23399797.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163791403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163791443) 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, 311128 + ... + 311653.

It is an arithmetic number, because the mean of its divisors is an integer number (41103612).

Almost surely, 2^163791403 is an apocalyptic number.

163791403 is a deficient number, since it is larger than the sum of its proper divisors (623045).

163791403 is an equidigital number, since it uses as much as digits as its factorization.

163791403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623044.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 163791403 is about 12798.1015389002. The cubic root of 163791403 is about 547.1381962187.

The spelling of 163791403 in words is "one hundred sixty-three million, seven hundred ninety-one thousand, four hundred three".