31303011213 has 12 divisors (see below), whose sum is σ = 45218138940. Its totient is φ = 20867438016.

The previous prime is 31303011211. The next prime is 31303011283. The reversal of 31303011213 is 31211030313.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10290479364 + 21012531849 = 101442^2 + 144957^2 .

It is not a de Polignac number, because 31303011213 - 2¹ = 31303011211 is a prime.

It is a super-2 number, since 2×31303011213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303011211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73243 + ... + 260711.

It is an arithmetic number, because the mean of its divisors is an integer number (3768178245).

Almost surely, 2^31303011213 is an apocalyptic number.

It is an amenable number.

31303011213 is a deficient number, since it is larger than the sum of its proper divisors (13915127727).

31303011213 is a wasteful number, since it uses less digits than its factorization.

31303011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206028 (or 206025 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31303011213 its reverse (31211030313), we get a palindrome (62514041526).

The spelling of 31303011213 in words is "thirty-one billion, three hundred three million, eleven thousand, two hundred thirteen".