31120031031 has 4 divisors (see below), whose sum is σ = 41493374712. Its totient is φ = 20746687352.

The previous prime is 31120031029. The next prime is 31120031057. The reversal of 31120031031 is 13013002113.

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 31120031031 - 2¹ = 31120031029 is a prime.

It is a super-2 number, since 2×31120031031² (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 31120031031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120038031) 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, 5186671836 + ... + 5186671841.

It is an arithmetic number, because the mean of its divisors is an integer number (10373343678).

Almost surely, 2^31120031031 is an apocalyptic number.

31120031031 is a deficient number, since it is larger than the sum of its proper divisors (10373343681).

31120031031 is a wasteful number, since it uses less digits than its factorization.

31120031031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373343680.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31120031031 its reverse (13013002113), we get a palindrome (44133033144).

The spelling of 31120031031 in words is "thirty-one billion, one hundred twenty million, thirty-one thousand, thirty-one".