163739491 has 8 divisors (see below), whose sum is σ = 166458560. Its totient is φ = 161028648.

The previous prime is 163739479. The next prime is 163739519. The reversal of 163739491 is 194937361.

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

It is a cyclic number.

It is not a de Polignac number, because 163739491 - 2¹³ = 163731299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163739431) 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, 47860 + ... + 51166.

It is an arithmetic number, because the mean of its divisors is an integer number (20807320).

Almost surely, 2^163739491 is an apocalyptic number.

163739491 is a deficient number, since it is larger than the sum of its proper divisors (2719069).

163739491 is an equidigital number, since it uses as much as digits as its factorization.

163739491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113.

The product of its digits is 122472, while the sum is 43.

The square root of 163739491 is about 12796.0732648731. The cubic root of 163739491 is about 547.0803868369.

The spelling of 163739491 in words is "one hundred sixty-three million, seven hundred thirty-nine thousand, four hundred ninety-one".