1081220013 has 6 divisors (see below), whose sum is σ = 1561762254. Its totient is φ = 720813336.

The previous prime is 1081220011. The next prime is 1081220033. The reversal of 1081220013 is 3100221801.

It can be written as a sum of positive squares in only one way, i.e., 871607529 + 209612484 = 29523^2 + 14478^2 .

It is not a de Polignac number, because 1081220013 - 2¹ = 1081220011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081220011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60067770 + ... + 60067787.

It is an arithmetic number, because the mean of its divisors is an integer number (260293709).

Almost surely, 2^1081220013 is an apocalyptic number.

It is an amenable number.

1081220013 is a deficient number, since it is larger than the sum of its proper divisors (480542241).

1081220013 is a wasteful number, since it uses less digits than its factorization.

1081220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120135563 (or 120135560 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1081220013 is about 32881.9101178748. The cubic root of 1081220013 is about 1026.3717546407.

Adding to 1081220013 its reverse (3100221801), we get a palindrome (4181441814).

The spelling of 1081220013 in words is "one billion, eighty-one million, two hundred twenty thousand, thirteen".