31651001197 has 2 divisors, whose sum is σ = 31651001198. Its totient is φ = 31651001196.

The previous prime is 31651001189. The next prime is 31651001227. The reversal of 31651001197 is 79110015613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25183785636 + 6467215561 = 158694^2 + 80419^2 .

It is an emirp because it is prime and its reverse (79110015613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31651001197 - 2³ = 31651001189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31651001177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15825500598 + 15825500599.

It is an arithmetic number, because the mean of its divisors is an integer number (15825500599).

Almost surely, 2^31651001197 is an apocalyptic number.

It is an amenable number.

31651001197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31651001197 is an equidigital number, since it uses as much as digits as its factorization.

31651001197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The spelling of 31651001197 in words is "thirty-one billion, six hundred fifty-one million, one thousand, one hundred ninety-seven".