31120000231 has 4 divisors (see below), whose sum is σ = 32757895000. Its totient is φ = 29482105464.

The previous prime is 31120000213. The next prime is 31120000271. The reversal of 31120000231 is 13200002113.

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 31120000231 - 2¹¹ = 31119998183 is a prime.

It is a super-2 number, since 2×31120000231² (a number of 22 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 (31120000271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818947356 + ... + 818947393.

It is an arithmetic number, because the mean of its divisors is an integer number (8189473750).

Almost surely, 2^31120000231 is an apocalyptic number.

31120000231 is a deficient number, since it is larger than the sum of its proper divisors (1637894769).

31120000231 is a wasteful number, since it uses less digits than its factorization.

31120000231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637894768.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31120000231 its reverse (13200002113), we get a palindrome (44320002344).

The spelling of 31120000231 in words is "thirty-one billion, one hundred twenty million, two hundred thirty-one", and thus it is an aban number.