203134505 has 16 divisors (see below), whose sum is σ = 290697984. Its totient is φ = 133235520.

The previous prime is 203134499. The next prime is 203134507. The reversal of 203134505 is 505431302.

It is not a de Polignac number, because 203134505 - 2⁴ = 203134489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203134507) 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 15 ways as a sum of consecutive naturals, for example, 125366 + ... + 126975.

It is an arithmetic number, because the mean of its divisors is an integer number (18168624).

Almost surely, 2^203134505 is an apocalyptic number.

It is an amenable number.

203134505 is a deficient number, since it is larger than the sum of its proper divisors (87563479).

203134505 is a wasteful number, since it uses less digits than its factorization.

203134505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252376.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 203134505 is about 14252.5262672973. The cubic root of 203134505 is about 587.8428407866.

Adding to 203134505 its reverse (505431302), we get a palindrome (708565807).

The spelling of 203134505 in words is "two hundred three million, one hundred thirty-four thousand, five hundred five".