305136213 has 32 divisors (see below), whose sum is σ = 448221312. Its totient is φ = 183859200.

The previous prime is 305136197. The next prime is 305136229. The reversal of 305136213 is 312631503.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (305136197) and next prime (305136229).

It is not a de Polignac number, because 305136213 - 2⁴ = 305136197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305136253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132633 + ... + 134913.

It is an arithmetic number, because the mean of its divisors is an integer number (14006916).

Almost surely, 2^305136213 is an apocalyptic number.

It is an amenable number.

305136213 is a deficient number, since it is larger than the sum of its proper divisors (143085099).

305136213 is a wasteful number, since it uses less digits than its factorization.

305136213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 305136213 is about 17468.1485281068. The cubic root of 305136213 is about 673.2317416628.

Adding to 305136213 its reverse (312631503), we get a palindrome (617767716).

The spelling of 305136213 in words is "three hundred five million, one hundred thirty-six thousand, two hundred thirteen".