203172113 has 2 divisors, whose sum is σ = 203172114. Its totient is φ = 203172112.

The previous prime is 203172091. The next prime is 203172157. The reversal of 203172113 is 311271302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159188689 + 43983424 = 12617^2 + 6632^2 .

It is a cyclic number.

It is not a de Polignac number, because 203172113 - 2¹⁶ = 203106577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (203172163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101586056 + 101586057.

It is an arithmetic number, because the mean of its divisors is an integer number (101586057).

Almost surely, 2^203172113 is an apocalyptic number.

It is an amenable number.

203172113 is a deficient number, since it is larger than the sum of its proper divisors (1).

203172113 is an equidigital number, since it uses as much as digits as its factorization.

203172113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 203172113 is about 14253.8455512890. The cubic root of 203172113 is about 587.8791159784.

The spelling of 203172113 in words is "two hundred three million, one hundred seventy-two thousand, one hundred thirteen".