161001523 has 2 divisors, whose sum is σ = 161001524. Its totient is φ = 161001522.

The previous prime is 161001521. The next prime is 161001551. The reversal of 161001523 is 325100161.

It is a weak prime.

It is an emirp because it is prime and its reverse (325100161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161001523 - 2¹ = 161001521 is a prime.

Together with 161001521, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161001523.

It is not a weakly prime, because it can be changed into another prime (161001521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80500761 + 80500762.

It is an arithmetic number, because the mean of its divisors is an integer number (80500762).

Almost surely, 2^161001523 is an apocalyptic number.

161001523 is a deficient number, since it is larger than the sum of its proper divisors (1).

161001523 is an equidigital number, since it uses as much as digits as its factorization.

161001523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 161001523 is about 12688.6375549150. The cubic root of 161001523 is about 544.0138979202.

Adding to 161001523 its reverse (325100161), we get a palindrome (486101684).

The spelling of 161001523 in words is "one hundred sixty-one million, one thousand, five hundred twenty-three".