305948161 has 4 divisors (see below), whose sum is σ = 306374400. Its totient is φ = 305521924.

The previous prime is 305948087. The next prime is 305948177. The reversal of 305948161 is 161849503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161849503 = 17 ⋅9520559.

It is a cyclic number.

It is not a de Polignac number, because 305948161 - 2²³ = 297559553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 305948161.

It is not an unprimeable number, because it can be changed into a prime (305948561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212041 + ... + 213478.

It is an arithmetic number, because the mean of its divisors is an integer number (76593600).

Almost surely, 2^305948161 is an apocalyptic number.

It is an amenable number.

305948161 is a deficient number, since it is larger than the sum of its proper divisors (426239).

305948161 is an equidigital number, since it uses as much as digits as its factorization.

305948161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426238.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 305948161 is about 17491.3739025841. The cubic root of 305948161 is about 673.8283550330.

The spelling of 305948161 in words is "three hundred five million, nine hundred forty-eight thousand, one hundred sixty-one".