305420081 has 4 divisors (see below), whose sum is σ = 307751664. Its totient is φ = 303088500.

The previous prime is 305420077. The next prime is 305420123. The reversal of 305420081 is 180024503.

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: 180024503 = 12109 ⋅14867.

It is a cyclic number.

It is not a de Polignac number, because 305420081 - 2² = 305420077 is a prime.

It is a super-2 number, since 2×305420081² = 186562851756093122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (305420281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165595 + ... + 1165856.

It is an arithmetic number, because the mean of its divisors is an integer number (76937916).

Almost surely, 2^305420081 is an apocalyptic number.

It is an amenable number.

305420081 is a deficient number, since it is larger than the sum of its proper divisors (2331583).

305420081 is a wasteful number, since it uses less digits than its factorization.

305420081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331582.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 305420081 is about 17476.2719422650. The cubic root of 305420081 is about 673.4404459591.

Adding to 305420081 its reverse (180024503), we get a palindrome (485444584).

The spelling of 305420081 in words is "three hundred five million, four hundred twenty thousand, eighty-one".