31111221313 has 8 divisors (see below), whose sum is σ = 31817387520. Its totient is φ = 30406897920.

The previous prime is 31111221311. The next prime is 31111221353. The reversal of 31111221313 is 31312211113.

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

It is a cyclic number.

It is not a de Polignac number, because 31111221313 - 2¹ = 31111221311 is a prime.

It is a super-3 number, since 3×31111221313³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31111221311) 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, 426528 + ... + 494113.

It is an arithmetic number, because the mean of its divisors is an integer number (3977173440).

Almost surely, 2^31111221313 is an apocalyptic number.

It is an amenable number.

31111221313 is a deficient number, since it is larger than the sum of its proper divisors (706166207).

31111221313 is an equidigital number, since it uses as much as digits as its factorization.

31111221313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921407.

The product of its digits is 108, while the sum is 19.

Adding to 31111221313 its reverse (31312211113), we get a palindrome (62423432426).

The spelling of 31111221313 in words is "thirty-one billion, one hundred eleven million, two hundred twenty-one thousand, three hundred thirteen".