31673196397 has 2 divisors, whose sum is σ = 31673196398. Its totient is φ = 31673196396.

The previous prime is 31673196377. The next prime is 31673196407. The reversal of 31673196397 is 79369137613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19349088201 + 12324108196 = 139101^2 + 111014^2 .

It is an emirp because it is prime and its reverse (79369137613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31673196397 - 2¹¹ = 31673194349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31673196377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836598198 + 15836598199.

It is an arithmetic number, because the mean of its divisors is an integer number (15836598199).

Almost surely, 2^31673196397 is an apocalyptic number.

It is an amenable number.

31673196397 is a deficient number, since it is larger than the sum of its proper divisors (1).

31673196397 is an equidigital number, since it uses as much as digits as its factorization.

31673196397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 55.

The spelling of 31673196397 in words is "thirty-one billion, six hundred seventy-three million, one hundred ninety-six thousand, three hundred ninety-seven".