1231543201 has 8 divisors (see below), whose sum is σ = 1408553984. Its totient is φ = 1054801440.

The previous prime is 1231543193. The next prime is 1231543207. The reversal of 1231543201 is 1023451321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231543201 - 2³ = 1231543193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231543207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57345 + ... + 75838.

It is an arithmetic number, because the mean of its divisors is an integer number (176069248).

Almost surely, 2^1231543201 is an apocalyptic number.

It is an amenable number.

1231543201 is a deficient number, since it is larger than the sum of its proper divisors (177010783).

1231543201 is a wasteful number, since it uses less digits than its factorization.

1231543201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134511.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1231543201 is about 35093.3498116096. The cubic root of 1231543201 is about 1071.8891716498.

Adding to 1231543201 its reverse (1023451321), we get a palindrome (2254994522).

The spelling of 1231543201 in words is "one billion, two hundred thirty-one million, five hundred forty-three thousand, two hundred one".