305143155 has 12 divisors (see below), whose sum is σ = 528914880. Its totient is φ = 162742992.

The previous prime is 305143151. The next prime is 305143169. The reversal of 305143155 is 551341503.

It is not a de Polignac number, because 305143155 - 2² = 305143151 is a prime.

It is a super-2 number, since 2×305143155² = 186224690086708050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (305143151) 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 11 ways as a sum of consecutive naturals, for example, 3390435 + ... + 3390524.

It is an arithmetic number, because the mean of its divisors is an integer number (44076240).

Almost surely, 2^305143155 is an apocalyptic number.

305143155 is a deficient number, since it is larger than the sum of its proper divisors (223771725).

305143155 is a wasteful number, since it uses less digits than its factorization.

305143155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780970 (or 6780967 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 305143155 is about 17468.3472314927. The cubic root of 305143155 is about 673.2368470760.

Adding to 305143155 its reverse (551341503), we get a palindrome (856484658).

The spelling of 305143155 in words is "three hundred five million, one hundred forty-three thousand, one hundred fifty-five".