161975263 has 2 divisors, whose sum is σ = 161975264. Its totient is φ = 161975262.

The previous prime is 161975251. The next prime is 161975291. The reversal of 161975263 is 362579161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161975263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161975293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80987631 + 80987632.

It is an arithmetic number, because the mean of its divisors is an integer number (80987632).

Almost surely, 2^161975263 is an apocalyptic number.

161975263 is a deficient number, since it is larger than the sum of its proper divisors (1).

161975263 is an equidigital number, since it uses as much as digits as its factorization.

161975263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 161975263 is about 12726.9502631227. The cubic root of 161975263 is about 545.1084294544.

The spelling of 161975263 in words is "one hundred sixty-one million, nine hundred seventy-five thousand, two hundred sixty-three".