31872206465209 has 32 divisors (see below), whose sum is σ = 36859999968000. Its totient is φ = 27276392943360.

The previous prime is 31872206465173. The next prime is 31872206465227. The reversal of 31872206465209 is 90256460227813.

It is a happy number.

It is not a de Polignac number, because 31872206465209 - 2¹⁵ = 31872206432441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31872206465209.

It is not an unprimeable number, because it can be changed into a prime (31872206465909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230607 + ... + 7987339.

It is an arithmetic number, because the mean of its divisors is an integer number (1151874999000).

It is a 1-persistent number, because it is pandigital, but 2⋅31872206465209 = 63744412930418 is not.

Almost surely, 2^{31872206465209} is an apocalyptic number.

It is an amenable number.

31872206465209 is a deficient number, since it is larger than the sum of its proper divisors (4987793502791).

31872206465209 is a wasteful number, since it uses less digits than its factorization.

31872206465209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7757025.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 31872206465209 in words is "thirty-one trillion, eight hundred seventy-two billion, two hundred six million, four hundred sixty-five thousand, two hundred nine".