305489133 has 24 divisors (see below), whose sum is σ = 467883000. Its totient is φ = 191407104.

The previous prime is 305489117. The next prime is 305489141. The reversal of 305489133 is 331984503.

It can be written as a sum of positive squares in 4 ways, for example, as 104898564 + 200590569 = 10242^2 + 14163^2 .

It is not a de Polignac number, because 305489133 - 2⁴ = 305489117 is a prime.

It is a super-2 number, since 2×305489133² = 186647220762183378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305489153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196443 + ... + 197991.

It is an arithmetic number, because the mean of its divisors is an integer number (19495125).

Almost surely, 2^305489133 is an apocalyptic number.

It is an amenable number.

305489133 is a deficient number, since it is larger than the sum of its proper divisors (162393867).

305489133 is a wasteful number, since it uses less digits than its factorization.

305489133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 305489133 is about 17478.2474235834. The cubic root of 305489133 is about 673.4911945383.

The spelling of 305489133 in words is "three hundred five million, four hundred eighty-nine thousand, one hundred thirty-three".