1231231201 has 4 divisors (see below), whose sum is σ = 1231360000. Its totient is φ = 1231102404.

The previous prime is 1231231159. The next prime is 1231231207. The reversal of 1231231201 is 1021321321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1021321321 = 19013 ⋅53717.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231231201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231231207) 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 3 ways as a sum of consecutive naturals, for example, 48801 + ... + 69598.

It is an arithmetic number, because the mean of its divisors is an integer number (307840000).

Almost surely, 2^1231231201 is an apocalyptic number.

It is an amenable number.

1231231201 is a deficient number, since it is larger than the sum of its proper divisors (128799).

1231231201 is a wasteful number, since it uses less digits than its factorization.

1231231201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128798.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231231201 is about 35088.9042433645. The cubic root of 1231231201 is about 1071.7986462919.

Adding to 1231231201 its reverse (1021321321), we get a palindrome (2252552522).

The spelling of 1231231201 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred one".