203123311901 has 2 divisors, whose sum is σ = 203123311902. Its totient is φ = 203123311900.

The previous prime is 203123311873. The next prime is 203123312003. The reversal of 203123311901 is 109113321302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202617016900 + 506295001 = 450130^2 + 22501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203123311901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203123311201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101561655950 + 101561655951.

It is an arithmetic number, because the mean of its divisors is an integer number (101561655951).

Almost surely, 2^203123311901 is an apocalyptic number.

It is an amenable number.

203123311901 is a deficient number, since it is larger than the sum of its proper divisors (1).

203123311901 is an equidigital number, since it uses as much as digits as its factorization.

203123311901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 203123311901 in words is "two hundred three billion, one hundred twenty-three million, three hundred eleven thousand, nine hundred one".