1231213201 has 8 divisors (see below), whose sum is σ = 1253081664. Its totient is φ = 1209470640.

The previous prime is 1231213189. The next prime is 1231213213. The reversal of 1231213201 is 1023121321.

It is an interprime number because it is at equal distance from previous prime (1231213189) and next prime (1231213213).

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

It is not a de Polignac number, because 1231213201 - 2¹³ = 1231205009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231213261) 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 7 ways as a sum of consecutive naturals, for example, 11635 + ... + 50968.

It is an arithmetic number, because the mean of its divisors is an integer number (156635208).

Almost surely, 2^1231213201 is an apocalyptic number.

It is an amenable number.

1231213201 is a deficient number, since it is larger than the sum of its proper divisors (21868463).

1231213201 is an equidigital number, since it uses as much as digits as its factorization.

1231213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62951.

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

The square root of 1231213201 is about 35088.6477510890. The cubic root of 1231213201 is about 1071.7934232085.

Adding to 1231213201 its reverse (1023121321), we get a palindrome (2254334522).

It can be divided in two parts, 123121320 and 1, that added together give a palindrome (123121321).

The spelling of 1231213201 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred one".