210131319997 has 2 divisors, whose sum is σ = 210131319998. Its totient is φ = 210131319996.

The previous prime is 210131319973. The next prime is 210131320043. The reversal of 210131319997 is 799913131012.

It is an a-pointer prime, because the next prime (210131320043) can be obtained adding 210131319997 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165800438596 + 44330881401 = 407186^2 + 210549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210131319997 is a prime.

It is a super-2 number, since 2×210131319997² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210131319917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105065659998 + 105065659999.

It is an arithmetic number, because the mean of its divisors is an integer number (105065659999).

Almost surely, 2^210131319997 is an apocalyptic number.

It is an amenable number.

210131319997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210131319997 is an equidigital number, since it uses as much as digits as its factorization.

210131319997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The spelling of 210131319997 in words is "two hundred ten billion, one hundred thirty-one million, three hundred nineteen thousand, nine hundred ninety-seven".