31115520197 has 2 divisors, whose sum is σ = 31115520198. Its totient is φ = 31115520196.

The previous prime is 31115520181. The next prime is 31115520199. The reversal of 31115520197 is 79102551113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22006535716 + 9108984481 = 148346^2 + 95441^2 .

It is a cyclic number.

It is not a de Polignac number, because 31115520197 - 2⁴ = 31115520181 is a prime.

Together with 31115520199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31115520199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15557760098 + 15557760099.

It is an arithmetic number, because the mean of its divisors is an integer number (15557760099).

Almost surely, 2^31115520197 is an apocalyptic number.

It is an amenable number.

31115520197 is a deficient number, since it is larger than the sum of its proper divisors (1).

31115520197 is an equidigital number, since it uses as much as digits as its factorization.

31115520197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 35.

The spelling of 31115520197 in words is "thirty-one billion, one hundred fifteen million, five hundred twenty thousand, one hundred ninety-seven".