31288105961 has 16 divisors (see below), whose sum is σ = 37736649600. Its totient is φ = 25341527808.

The previous prime is 31288105949. The next prime is 31288105969. The reversal of 31288105961 is 16950188213.

It is a cyclic number.

It is not a de Polignac number, because 31288105961 - 2²² = 31283911657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31288105969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250640 + ... + 354113.

It is an arithmetic number, because the mean of its divisors is an integer number (2358540600).

Almost surely, 2^31288105961 is an apocalyptic number.

It is an amenable number.

31288105961 is a deficient number, since it is larger than the sum of its proper divisors (6448543639).

31288105961 is a wasteful number, since it uses less digits than its factorization.

31288105961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605168.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 31288105961 in words is "thirty-one billion, two hundred eighty-eight million, one hundred five thousand, nine hundred sixty-one".