163265251 has 6 divisors (see below), whose sum is σ = 168702756. Its totient is φ = 157997700.

The previous prime is 163265243. The next prime is 163265257. The reversal of 163265251 is 152562361.

It is not a de Polignac number, because 163265251 - 2³ = 163265243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163265257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83985 + ... + 85906.

It is an arithmetic number, because the mean of its divisors is an integer number (28117126).

Almost surely, 2^163265251 is an apocalyptic number.

163265251 is a deficient number, since it is larger than the sum of its proper divisors (5437505).

163265251 is an equidigital number, since it uses as much as digits as its factorization.

163265251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169953 (or 169922 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 163265251 is about 12777.5291429916. The cubic root of 163265251 is about 546.5517049965.

The spelling of 163265251 in words is "one hundred sixty-three million, two hundred sixty-five thousand, two hundred fifty-one".