203972317 has 4 divisors (see below), whose sum is σ = 204173116. Its totient is φ = 203771520.

The previous prime is 203972311. The next prime is 203972333. The reversal of 203972317 is 713279302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149964516 + 54007801 = 12246^2 + 7349^2 .

It is a cyclic number.

It is not a de Polignac number, because 203972317 - 2⁷ = 203972189 is a prime.

It is a super-2 number, since 2×203972317² = 83209412204696978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203972311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98868 + ... + 100909.

It is an arithmetic number, because the mean of its divisors is an integer number (51043279).

Almost surely, 2^203972317 is an apocalyptic number.

It is an amenable number.

203972317 is a deficient number, since it is larger than the sum of its proper divisors (200799).

203972317 is a wasteful number, since it uses less digits than its factorization.

203972317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200798.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 203972317 is about 14281.8877253674. The cubic root of 203972317 is about 588.6499024896.

The spelling of 203972317 in words is "two hundred three million, nine hundred seventy-two thousand, three hundred seventeen".