1311021002 has 16 divisors (see below), whose sum is σ = 2016289800. Its totient is φ = 638952960.

The previous prime is 1311021001. The next prime is 1311021007. The reversal of 1311021002 is 2001201131.

It can be written as a sum of positive squares in 4 ways, for example, as 1009269361 + 301751641 = 31769^2 + 17371^2 .

It is not an unprimeable number, because it can be changed into a prime (1311021001) 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, 94274 + ... + 107282.

Almost surely, 2^1311021002 is an apocalyptic number.

1311021002 is a deficient number, since it is larger than the sum of its proper divisors (705268798).

1311021002 is a wasteful number, since it uses less digits than its factorization.

1311021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14281.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1311021002 is about 36208.0240002130. The cubic root of 1311021002 is about 1094.4683732534.

Adding to 1311021002 its reverse (2001201131), we get a palindrome (3312222133).

The spelling of 1311021002 in words is "one billion, three hundred eleven million, twenty-one thousand, two".