31332195397 has 2 divisors, whose sum is σ = 31332195398. Its totient is φ = 31332195396.

The previous prime is 31332195343. The next prime is 31332195421. The reversal of 31332195397 is 79359123313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25039581121 + 6292614276 = 158239^2 + 79326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31332195397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31332195997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15666097698 + 15666097699.

It is an arithmetic number, because the mean of its divisors is an integer number (15666097699).

Almost surely, 2^31332195397 is an apocalyptic number.

It is an amenable number.

31332195397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31332195397 is an equidigital number, since it uses as much as digits as its factorization.

31332195397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 459270, while the sum is 46.

The spelling of 31332195397 in words is "thirty-one billion, three hundred thirty-two million, one hundred ninety-five thousand, three hundred ninety-seven".