31321223001997 has 2 divisors, whose sum is σ = 31321223001998. Its totient is φ = 31321223001996.

The previous prime is 31321223001967. The next prime is 31321223002019. The reversal of 31321223001997 is 79910032212313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18794904125481 + 12526318876516 = 4335309^2 + 3539254^2 .

It is an emirp because it is prime and its reverse (79910032212313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321223001997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321223001967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660611500998 + 15660611500999.

It is an arithmetic number, because the mean of its divisors is an integer number (15660611500999).

Almost surely, 2^{31321223001997} is an apocalyptic number.

It is an amenable number.

31321223001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321223001997 is an equidigital number, since it uses as much as digits as its factorization.

31321223001997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 31321223001997 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty-three million, one thousand, nine hundred ninety-seven".