31862322397 has 2 divisors, whose sum is σ = 31862322398. Its totient is φ = 31862322396.

The previous prime is 31862322377. The next prime is 31862322407. The reversal of 31862322397 is 79322326813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31164253156 + 698069241 = 176534^2 + 26421^2 .

It is an emirp because it is prime and its reverse (79322326813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31862322397 - 2³¹ = 29714838749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31862322347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15931161198 + 15931161199.

It is an arithmetic number, because the mean of its divisors is an integer number (15931161199).

Almost surely, 2^31862322397 is an apocalyptic number.

It is an amenable number.

31862322397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31862322397 is an equidigital number, since it uses as much as digits as its factorization.

31862322397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 46.

The spelling of 31862322397 in words is "thirty-one billion, eight hundred sixty-two million, three hundred twenty-two thousand, three hundred ninety-seven".