1031220013 has 4 divisors (see below), whose sum is σ = 1031405500. Its totient is φ = 1031034528.

The previous prime is 1031219977. The next prime is 1031220059. The reversal of 1031220013 is 3100221301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103286569 + 927933444 = 10163^2 + 30462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031220013 - 2¹³ = 1031211821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031219975 and 1031220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031220313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84138 + ... + 95611.

It is an arithmetic number, because the mean of its divisors is an integer number (257851375).

Almost surely, 2^1031220013 is an apocalyptic number.

It is an amenable number.

1031220013 is a deficient number, since it is larger than the sum of its proper divisors (185487).

1031220013 is an equidigital number, since it uses as much as digits as its factorization.

1031220013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185486.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1031220013 is about 32112.6145463119. The cubic root of 1031220013 is about 1010.3002123605.

Adding to 1031220013 its reverse (3100221301), we get a palindrome (4131441314).

The spelling of 1031220013 in words is "one billion, thirty-one million, two hundred twenty thousand, thirteen".