31003220131231 has 16 divisors (see below), whose sum is σ = 32802019246080. Its totient is φ = 29262347785440.

The previous prime is 31003220131229. The next prime is 31003220131309. The reversal of 31003220131231 is 13213102230013.

It is a cyclic number.

It is not a de Polignac number, because 31003220131231 - 2¹ = 31003220131229 is a prime.

It is a super-2 number, since 2×31003220131231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003220191231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66503596 + ... + 66968161.

It is an arithmetic number, because the mean of its divisors is an integer number (2050126202880).

Almost surely, 2^{31003220131231} is an apocalyptic number.

31003220131231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31003220131231 is a deficient number, since it is larger than the sum of its proper divisors (1798799114849).

31003220131231 is a wasteful number, since it uses less digits than its factorization.

31003220131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133471974.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31003220131231 its reverse (13213102230013), we get a palindrome (44216322361244).

The spelling of 31003220131231 in words is "thirty-one trillion, three billion, two hundred twenty million, one hundred thirty-one thousand, two hundred thirty-one".