31100220231 has 4 divisors (see below), whose sum is σ = 41466960312. Its totient is φ = 20733480152.

The previous prime is 31100220227. The next prime is 31100220287. The reversal of 31100220231 is 13202200113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31100220231 - 2² = 31100220227 is a prime.

It is a super-2 number, since 2×31100220231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31100220231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100220731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5183370036 + ... + 5183370041.

It is an arithmetic number, because the mean of its divisors is an integer number (10366740078).

Almost surely, 2^31100220231 is an apocalyptic number.

31100220231 is a deficient number, since it is larger than the sum of its proper divisors (10366740081).

31100220231 is a wasteful number, since it uses less digits than its factorization.

31100220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10366740080.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31100220231 its reverse (13202200113), we get a palindrome (44302420344).

The spelling of 31100220231 in words is "thirty-one billion, one hundred million, two hundred twenty thousand, two hundred thirty-one".