31201312043213 has 4 divisors (see below), whose sum is σ = 33601412969628. Its totient is φ = 28801211116800.

The previous prime is 31201312043191. The next prime is 31201312043233. The reversal of 31201312043213 is 31234021310213.

It is a happy number.

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 2307537207364 + 28893774835849 = 1519058^2 + 5375293^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201312043213 - 2¹⁸ = 31201311781069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201312043233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200050463188 + ... + 1200050463213.

It is an arithmetic number, because the mean of its divisors is an integer number (8400353242407).

Almost surely, 2^{31201312043213} is an apocalyptic number.

It is an amenable number.

31201312043213 is a deficient number, since it is larger than the sum of its proper divisors (2400100926415).

31201312043213 is a wasteful number, since it uses less digits than its factorization.

31201312043213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400100926414.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31201312043213 its reverse (31234021310213), we get a palindrome (62435333353426).

The spelling of 31201312043213 in words is "thirty-one trillion, two hundred one billion, three hundred twelve million, forty-three thousand, two hundred thirteen".