203649489 has 6 divisors (see below), whose sum is σ = 294160386. Its totient is φ = 135766320.

The previous prime is 203649469. The next prime is 203649499. The reversal of 203649489 is 984946302.

It can be written as a sum of positive squares in only one way, i.e., 201867264 + 1782225 = 14208^2 + 1335^2 .

It is not a de Polignac number, because 203649489 - 2⁷ = 203649361 is a prime.

It is a super-2 number, since 2×203649489² = 82946228739922242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203649469) 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 5 ways as a sum of consecutive naturals, for example, 11313852 + ... + 11313869.

It is an arithmetic number, because the mean of its divisors is an integer number (49026731).

Almost surely, 2^203649489 is an apocalyptic number.

It is an amenable number.

203649489 is a deficient number, since it is larger than the sum of its proper divisors (90510897).

203649489 is a wasteful number, since it uses less digits than its factorization.

203649489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22627727 (or 22627724 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 203649489 is about 14270.5812425423. The cubic root of 203649489 is about 588.3391854652.

The spelling of 203649489 in words is "two hundred three million, six hundred forty-nine thousand, four hundred eighty-nine".