1231203409 has 24 divisors (see below), whose sum is σ = 1353848256. Its totient is φ = 1117116000.

The previous prime is 1231203373. The next prime is 1231203419. The reversal of 1231203409 is 9043021321.

It is a de Polignac number, because none of the positive numbers 2^k-1231203409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231203419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1170934 + ... + 1171984.

It is an arithmetic number, because the mean of its divisors is an integer number (56410344).

Almost surely, 2^1231203409 is an apocalyptic number.

It is an amenable number.

1231203409 is a deficient number, since it is larger than the sum of its proper divisors (122644847).

1231203409 is a wasteful number, since it uses less digits than its factorization.

1231203409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1231203409 is about 35088.5082185037. The cubic root of 1231203409 is about 1071.7905818298.

The spelling of 1231203409 in words is "one billion, two hundred thirty-one million, two hundred three thousand, four hundred nine".