163838261 has 6 divisors (see below), whose sum is σ = 165486786. Its totient is φ = 162206000.

The previous prime is 163838239. The next prime is 163838263. The reversal of 163838261 is 162838361.

It can be written as a sum of positive squares in 3 ways, for example, as 57851236 + 105987025 = 7606^2 + 10295^2 .

It is not a de Polignac number, because 163838261 - 2¹⁸ = 163576117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163838263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2171 + ... + 18231.

It is an arithmetic number, because the mean of its divisors is an integer number (27581131).

Almost surely, 2^163838261 is an apocalyptic number.

It is an amenable number.

163838261 is a deficient number, since it is larger than the sum of its proper divisors (1648525).

163838261 is an equidigital number, since it uses as much as digits as its factorization.

163838261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16263 (or 16162 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 163838261 is about 12799.9320701322. The cubic root of 163838261 is about 547.1903669608.

The spelling of 163838261 in words is "one hundred sixty-three million, eight hundred thirty-eight thousand, two hundred sixty-one".