1212131001 has 4 divisors (see below), whose sum is σ = 1616174672. Its totient is φ = 808087332.

The previous prime is 1212130979. The next prime is 1212131003. The reversal of 1212131001 is 1001312121.

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.

It is not a de Polignac number, because 1212131001 - 2⁹ = 1212130489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212131003) 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 3 ways as a sum of consecutive naturals, for example, 202021831 + ... + 202021836.

It is an arithmetic number, because the mean of its divisors is an integer number (404043668).

Almost surely, 2^1212131001 is an apocalyptic number.

It is an amenable number.

1212131001 is a deficient number, since it is larger than the sum of its proper divisors (404043671).

1212131001 is an equidigital number, since it uses as much as digits as its factorization.

1212131001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404043670.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1212131001 is about 34815.6717729243. The cubic root of 1212131001 is about 1066.2274344680.

Adding to 1212131001 its reverse (1001312121), we get a palindrome (2213443122).

The spelling of 1212131001 in words is "one billion, two hundred twelve million, one hundred thirty-one thousand, one".