1311021013 has 8 divisors (see below), whose sum is σ = 1318734648. Its totient is φ = 1303318464.

The previous prime is 1311021007. The next prime is 1311021029. The reversal of 1311021013 is 3101201131.

It can be written as a sum of positive squares in 4 ways, for example, as 808947364 + 502073649 = 28442^2 + 22407^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311021013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311020984 and 1311021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311021053) 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, 386995 + ... + 390367.

It is an arithmetic number, because the mean of its divisors is an integer number (164841831).

Almost surely, 2^1311021013 is an apocalyptic number.

It is an amenable number.

1311021013 is a deficient number, since it is larger than the sum of its proper divisors (7713635).

1311021013 is a wasteful number, since it uses less digits than its factorization.

1311021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543.

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

The square root of 1311021013 is about 36208.0241521130. The cubic root of 1311021013 is about 1094.4683763144.

Adding to 1311021013 its reverse (3101201131), we get a palindrome (4412222144).

The spelling of 1311021013 in words is "one billion, three hundred eleven million, twenty-one thousand, thirteen".