171396690431 has 2 divisors, whose sum is σ = 171396690432. Its totient is φ = 171396690430.

The previous prime is 171396690373. The next prime is 171396690523. The reversal of 171396690431 is 134096693171.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171396690431 is a prime.

It is a super-2 number, since 2×171396690431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171396690431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171396693431) 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, 85698345215 + 85698345216.

It is an arithmetic number, because the mean of its divisors is an integer number (85698345216).

Almost surely, 2^171396690431 is an apocalyptic number.

171396690431 is a deficient number, since it is larger than the sum of its proper divisors (1).

171396690431 is an equidigital number, since it uses as much as digits as its factorization.

171396690431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 171396690431 in words is "one hundred seventy-one billion, three hundred ninety-six million, six hundred ninety thousand, four hundred thirty-one".