31120240105 has 16 divisors (see below), whose sum is σ = 37539532800. Its totient is φ = 24766217280.

The previous prime is 31120240093. The next prime is 31120240117. The reversal of 31120240105 is 50104202113.

It is an interprime number because it is at equal distance from previous prime (31120240093) and next prime (31120240117).

It is a de Polignac number, because none of the positive numbers 2^k-31120240105 is a prime.

It is a super-2 number, since 2×31120240105² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1398456 + ... + 1420534.

It is an arithmetic number, because the mean of its divisors is an integer number (2346220800).

Almost surely, 2^31120240105 is an apocalyptic number.

It is an amenable number.

31120240105 is a deficient number, since it is larger than the sum of its proper divisors (6419292695).

31120240105 is a wasteful number, since it uses less digits than its factorization.

31120240105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23544.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 31120240105 its reverse (50104202113), we get a palindrome (81224442218).

The spelling of 31120240105 in words is "thirty-one billion, one hundred twenty million, two hundred forty thousand, one hundred five".