1802311231213 has 4 divisors (see below), whose sum is σ = 1802530152508. Its totient is φ = 1802092309920.

The previous prime is 1802311231103. The next prime is 1802311231219. The reversal of 1802311231213 is 3121321132081.

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 1273146642244 + 529164588969 = 1128338^2 + 727437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1802311231213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1802311231219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109448298 + ... + 109464763.

It is an arithmetic number, because the mean of its divisors is an integer number (450632538127).

Almost surely, 2^{1802311231213} is an apocalyptic number.

It is an amenable number.

1802311231213 is a deficient number, since it is larger than the sum of its proper divisors (218921295).

1802311231213 is an equidigital number, since it uses as much as digits as its factorization.

1802311231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218921294.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 1802311231213 its reverse (3121321132081), we get a palindrome (4923632363294).

The spelling of 1802311231213 in words is "one trillion, eight hundred two billion, three hundred eleven million, two hundred thirty-one thousand, two hundred thirteen".