161585533 has 2 divisors, whose sum is σ = 161585534. Its totient is φ = 161585532.

The previous prime is 161585521. The next prime is 161585569. The reversal of 161585533 is 335585161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117787609 + 43797924 = 10853^2 + 6618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161585533 is a prime.

It is a super-2 number, since 2×161585533² = 52219768949788178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161585492 and 161585501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161585033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80792766 + 80792767.

It is an arithmetic number, because the mean of its divisors is an integer number (80792767).

Almost surely, 2^161585533 is an apocalyptic number.

It is an amenable number.

161585533 is a deficient number, since it is larger than the sum of its proper divisors (1).

161585533 is an equidigital number, since it uses as much as digits as its factorization.

161585533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The square root of 161585533 is about 12711.6298325588. The cubic root of 161585533 is about 544.6708817264.

The spelling of 161585533 in words is "one hundred sixty-one million, five hundred eighty-five thousand, five hundred thirty-three".