31671421313 has 6 divisors (see below), whose sum is σ = 36842265666. Its totient is φ = 27146932512.

The previous prime is 31671421279. The next prime is 31671421321. The reversal of 31671421313 is 31312417613.

It can be written as a sum of positive squares in only one way, i.e., 28151135089 + 3520286224 = 167783^2 + 59332^2 .

It is not a de Polignac number, because 31671421313 - 2⁸ = 31671421057 is a prime.

It is a super-5 number, since 5×31671421313⁵ (a number of 54 digits) contains 55555 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31671421313.

It is not an unprimeable number, because it can be changed into a prime (31671421213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323177720 + ... + 323177817.

It is an arithmetic number, because the mean of its divisors is an integer number (6140377611).

Almost surely, 2^31671421313 is an apocalyptic number.

It is an amenable number.

31671421313 is a deficient number, since it is larger than the sum of its proper divisors (5170844353).

31671421313 is an equidigital number, since it uses as much as digits as its factorization.

31671421313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646355551 (or 646355544 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

Adding to 31671421313 its reverse (31312417613), we get a palindrome (62983838926).

The spelling of 31671421313 in words is "thirty-one billion, six hundred seventy-one million, four hundred twenty-one thousand, three hundred thirteen".