1231212001 has 4 divisors (see below), whose sum is σ = 1261241604. Its totient is φ = 1201182400.

The previous prime is 1231211987. The next prime is 1231212049. The reversal of 1231212001 is 1002121321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 360962001 + 870250000 = 18999^2 + 29500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231212001 - 2⁹ = 1231211489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231212071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15014740 + ... + 15014821.

It is an arithmetic number, because the mean of its divisors is an integer number (315310401).

Almost surely, 2^1231212001 is an apocalyptic number.

It is an amenable number.

1231212001 is a deficient number, since it is larger than the sum of its proper divisors (30029603).

1231212001 is an equidigital number, since it uses as much as digits as its factorization.

1231212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30029602.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1231212001 is about 35088.6306515373. The cubic root of 1231212001 is about 1071.7930750011.

Adding to 1231212001 its reverse (1002121321), we get a palindrome (2233333322).

The spelling of 1231212001 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, one".