163120251 has 8 divisors (see below), whose sum is σ = 248564224. Its totient is φ = 93211560.

The previous prime is 163120231. The next prime is 163120259. The reversal of 163120251 is 152021361.

163120251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 163120251 - 2¹⁰ = 163119227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 7767631 = 163120251 / (1 + 6 + 3 + 1 + 2 + 0 + 2 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163120259) 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, 3883795 + ... + 3883836.

It is an arithmetic number, because the mean of its divisors is an integer number (31070528).

Almost surely, 2^163120251 is an apocalyptic number.

163120251 is a deficient number, since it is larger than the sum of its proper divisors (85443973).

163120251 is an equidigital number, since it uses as much as digits as its factorization.

163120251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7767641.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 163120251 is about 12771.8538591702. The cubic root of 163120251 is about 546.3898549404.

The spelling of 163120251 in words is "one hundred sixty-three million, one hundred twenty thousand, two hundred fifty-one".