501097171997 has 2 divisors, whose sum is σ = 501097171998. Its totient is φ = 501097171996.

The previous prime is 501097171969. The next prime is 501097172027. The reversal of 501097171997 is 799171790105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411931628761 + 89165543236 = 641819^2 + 298606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501097171997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501097171097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250548585998 + 250548585999.

It is an arithmetic number, because the mean of its divisors is an integer number (250548585999).

Almost surely, 2^501097171997 is an apocalyptic number.

It is an amenable number.

501097171997 is a deficient number, since it is larger than the sum of its proper divisors (1).

501097171997 is an equidigital number, since it uses as much as digits as its factorization.

501097171997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1250235, while the sum is 56.

The spelling of 501097171997 in words is "five hundred one billion, ninety-seven million, one hundred seventy-one thousand, nine hundred ninety-seven".