163138291 has 4 divisors (see below), whose sum is σ = 167547472. Its totient is φ = 158729112.

The previous prime is 163138289. The next prime is 163138309. The reversal of 163138291 is 192831361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192831361 = 19 ⋅10149019.

It is not a de Polignac number, because 163138291 - 2¹ = 163138289 is a prime.

It is a super-2 number, since 2×163138291² = 53228203980801362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163138271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2204535 + ... + 2204608.

It is an arithmetic number, because the mean of its divisors is an integer number (41886868).

Almost surely, 2^163138291 is an apocalyptic number.

163138291 is a deficient number, since it is larger than the sum of its proper divisors (4409181).

163138291 is an equidigital number, since it uses as much as digits as its factorization.

163138291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4409180.

The product of its digits is 7776, while the sum is 34.

The square root of 163138291 is about 12772.5600801092. The cubic root of 163138291 is about 546.4099965426.

The spelling of 163138291 in words is "one hundred sixty-three million, one hundred thirty-eight thousand, two hundred ninety-one".