203172969481 has 2 divisors, whose sum is σ = 203172969482. Its totient is φ = 203172969480.

The previous prime is 203172969413. The next prime is 203172969509. The reversal of 203172969481 is 184969271302.

203172969481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168719670025 + 34453299456 = 410755^2 + 185616^2 .

It is a cyclic number.

It is not a de Polignac number, because 203172969481 - 2²¹ = 203170872329 is a prime.

It is a super-2 number, since 2×203172969481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203172969581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101586484740 + 101586484741.

It is an arithmetic number, because the mean of its divisors is an integer number (101586484741).

Almost surely, 2^203172969481 is an apocalyptic number.

It is an amenable number.

203172969481 is a deficient number, since it is larger than the sum of its proper divisors (1).

203172969481 is an equidigital number, since it uses as much as digits as its factorization.

203172969481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 203172969481 in words is "two hundred three billion, one hundred seventy-two million, nine hundred sixty-nine thousand, four hundred eighty-one".