161532523 has 4 divisors (see below), whose sum is σ = 167102640. Its totient is φ = 155962408.

The previous prime is 161532517. The next prime is 161532529. The reversal of 161532523 is 325235161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325235161 = 1453 ⋅223837.

It is an interprime number because it is at equal distance from previous prime (161532517) and next prime (161532529).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161532523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161532491 and 161532500.

It is not an unprimeable number, because it can be changed into a prime (161532529) 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 in 3 ways as a sum of consecutive naturals, for example, 2785015 + ... + 2785072.

It is an arithmetic number, because the mean of its divisors is an integer number (41775660).

Almost surely, 2^161532523 is an apocalyptic number.

161532523 is a deficient number, since it is larger than the sum of its proper divisors (5570117).

161532523 is an equidigital number, since it uses as much as digits as its factorization.

161532523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5570116.

The product of its digits is 5400, while the sum is 28.

The square root of 161532523 is about 12709.5445630439. The cubic root of 161532523 is about 544.6113133545.

Adding to 161532523 its reverse (325235161), we get a palindrome (486767684).

The spelling of 161532523 in words is "one hundred sixty-one million, five hundred thirty-two thousand, five hundred twenty-three".