31639898890009 has 2 divisors, whose sum is σ = 31639898890010. Its totient is φ = 31639898890008.

The previous prime is 31639898889961. The next prime is 31639898890081. The reversal of 31639898890009 is 90009889893613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31573217190025 + 66681699984 = 5619005^2 + 258228^2 .

It is an emirp because it is prime and its reverse (90009889893613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31639898890009 is a prime.

It is not a weakly prime, because it can be changed into another prime (31639898890109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15819949445004 + 15819949445005.

It is an arithmetic number, because the mean of its divisors is an integer number (15819949445005).

Almost surely, 2^{31639898890009} is an apocalyptic number.

It is an amenable number.

31639898890009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31639898890009 is an equidigital number, since it uses as much as digits as its factorization.

31639898890009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181398528, while the sum is 73.

The spelling of 31639898890009 in words is "thirty-one trillion, six hundred thirty-nine billion, eight hundred ninety-eight million, eight hundred ninety thousand, nine".