1213311001 has 6 divisors (see below), whose sum is σ = 1411402650. Its totient is φ = 1039980816.

The previous prime is 1213310963. The next prime is 1213311013. The reversal of 1213311001 is 1001133121.

It can be written as a sum of positive squares in only one way, i.e., 1207910025 + 5400976 = 34755^2 + 2324^2 .

It is not a de Polignac number, because 1213311001 - 2¹¹ = 1213308953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213311601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12380676 + ... + 12380773.

It is an arithmetic number, because the mean of its divisors is an integer number (235233775).

Almost surely, 2^1213311001 is an apocalyptic number.

It is an amenable number.

1213311001 is a deficient number, since it is larger than the sum of its proper divisors (198091649).

1213311001 is an equidigital number, since it uses as much as digits as its factorization.

1213311001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24761463 (or 24761456 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1213311001 is about 34832.6140420153. The cubic root of 1213311001 is about 1066.5733102649.

Adding to 1213311001 its reverse (1001133121), we get a palindrome (2214444122).

The spelling of 1213311001 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, one".