203431997 has 2 divisors, whose sum is σ = 203431998. Its totient is φ = 203431996.

The previous prime is 203431981. The next prime is 203432083. The reversal of 203431997 is 799134302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174927076 + 28504921 = 13226^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 203431997 - 2⁴ = 203431981 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203431997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203431927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101715998 + 101715999.

It is an arithmetic number, because the mean of its divisors is an integer number (101715999).

Almost surely, 2^203431997 is an apocalyptic number.

It is an amenable number.

203431997 is a deficient number, since it is larger than the sum of its proper divisors (1).

203431997 is an equidigital number, since it uses as much as digits as its factorization.

203431997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 203431997 is about 14262.9589146152. The cubic root of 203431997 is about 588.1296675561.

The spelling of 203431997 in words is "two hundred three million, four hundred thirty-one thousand, nine hundred ninety-seven".