1311221001 has 8 divisors (see below), whose sum is σ = 1754262720. Its totient is φ = 871163312.

The previous prime is 1311220979. The next prime is 1311221039. The reversal of 1311221001 is 1001221131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311221001 - 2⁷ = 1311220873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311221501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744981 + ... + 746738.

It is an arithmetic number, because the mean of its divisors is an integer number (219282840).

Almost surely, 2^1311221001 is an apocalyptic number.

It is an amenable number.

1311221001 is a deficient number, since it is larger than the sum of its proper divisors (443041719).

1311221001 is a wasteful number, since it uses less digits than its factorization.

1311221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492015.

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

The square root of 1311221001 is about 36210.7856998436. The cubic root of 1311221001 is about 1094.5240249046.

Adding to 1311221001 its reverse (1001221131), we get a palindrome (2312442132).

The spelling of 1311221001 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, one".