31321640106 has 72 divisors (see below), whose sum is σ = 75836710404. Its totient is φ = 9309185280.

The previous prime is 31321640057. The next prime is 31321640107. The reversal of 31321640106 is 60104612313.

31321640106 is a `hidden beast` number, since 3 + 1 + 3 + 2 + 1 + 640 + 10 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27987617025 + 3334023081 = 167295^2 + 57741^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31321640106.

It is not an unprimeable number, because it can be changed into a prime (31321640107) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 31305 + ... + 252236.

Almost surely, 2^31321640106 is an apocalyptic number.

31321640106 is an abundant number, since it is smaller than the sum of its proper divisors (44515070298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321640106 is a wasteful number, since it uses less digits than its factorization.

31321640106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283604 (or 283582 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The spelling of 31321640106 in words is "thirty-one billion, three hundred twenty-one million, six hundred forty thousand, one hundred six".