231209999903 has 2 divisors, whose sum is σ = 231209999904. Its totient is φ = 231209999902.

The previous prime is 231209999899. The next prime is 231210000017. The reversal of 231209999903 is 309999902132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231209999903 - 2² = 231209999899 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231209999803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115604999951 + 115604999952.

It is an arithmetic number, because the mean of its divisors is an integer number (115604999952).

Almost surely, 2^231209999903 is an apocalyptic number.

231209999903 is a deficient number, since it is larger than the sum of its proper divisors (1).

231209999903 is an equidigital number, since it uses as much as digits as its factorization.

231209999903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2125764, while the sum is 56.

The spelling of 231209999903 in words is "two hundred thirty-one billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred three".