163870491 has 8 divisors (see below), whose sum is σ = 220498960. Its totient is φ = 108244512.

The previous prime is 163870471. The next prime is 163870501. The reversal of 163870491 is 194078361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163870491 - 2¹⁰ = 163869467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163870451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250240 + ... + 250893.

It is an arithmetic number, because the mean of its divisors is an integer number (27562370).

Almost surely, 2^163870491 is an apocalyptic number.

163870491 is a deficient number, since it is larger than the sum of its proper divisors (56628469).

163870491 is a wasteful number, since it uses less digits than its factorization.

163870491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501245.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 163870491 is about 12801.1909992782. The cubic root of 163870491 is about 547.2262454122.

The spelling of 163870491 in words is "one hundred sixty-three million, eight hundred seventy thousand, four hundred ninety-one".