31040120105 has 16 divisors (see below), whose sum is σ = 38307207504. Its totient is φ = 24127891200.

The previous prime is 31040120099. The next prime is 31040120117. The reversal of 31040120105 is 50102104013.

It can be written as a sum of positive squares in 8 ways, for example, as 13858940176 + 17181179929 = 117724^2 + 131077^2 .

It is not a de Polignac number, because 31040120105 - 2⁸ = 31040119849 is a prime.

It is a super-2 number, since 2×31040120105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 21155 + ... + 250055.

It is an arithmetic number, because the mean of its divisors is an integer number (2394200469).

Almost surely, 2^31040120105 is an apocalyptic number.

It is an amenable number.

31040120105 is a deficient number, since it is larger than the sum of its proper divisors (7267087399).

31040120105 is a wasteful number, since it uses less digits than its factorization.

31040120105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229676.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 31040120105 its reverse (50102104013), we get a palindrome (81142224118).

The spelling of 31040120105 in words is "thirty-one billion, forty million, one hundred twenty thousand, one hundred five".