161659523 has 2 divisors, whose sum is σ = 161659524. Its totient is φ = 161659522.

The previous prime is 161659501. The next prime is 161659567. The reversal of 161659523 is 325956161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161659523 - 2¹⁶ = 161593987 is a prime.

It is a super-3 number, since 3×161659523³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (161659583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80829761 + 80829762.

It is an arithmetic number, because the mean of its divisors is an integer number (80829762).

Almost surely, 2^161659523 is an apocalyptic number.

161659523 is a deficient number, since it is larger than the sum of its proper divisors (1).

161659523 is an equidigital number, since it uses as much as digits as its factorization.

161659523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 161659523 is about 12714.5398265136. The cubic root of 161659523 is about 544.7540039552.

The spelling of 161659523 in words is "one hundred sixty-one million, six hundred fifty-nine thousand, five hundred twenty-three".