161245823 has 4 divisors (see below), whose sum is σ = 161327400. Its totient is φ = 161164248.

The previous prime is 161245817. The next prime is 161245871. The reversal of 161245823 is 328542161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161245823 - 2¹⁰ = 161244799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161245823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161241823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37748 + ... + 41801.

It is an arithmetic number, because the mean of its divisors is an integer number (40331850).

Almost surely, 2^161245823 is an apocalyptic number.

161245823 is a deficient number, since it is larger than the sum of its proper divisors (81577).

161245823 is an equidigital number, since it uses as much as digits as its factorization.

161245823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81576.

The product of its digits is 11520, while the sum is 32.

The square root of 161245823 is about 12698.2606289208. The cubic root of 161245823 is about 544.2889169144.

Adding to 161245823 its reverse (328542161), we get a palindrome (489787984).

The spelling of 161245823 in words is "one hundred sixty-one million, two hundred forty-five thousand, eight hundred twenty-three".