161018521 has 8 divisors (see below), whose sum is σ = 173628000. Its totient is φ = 148822560.

The previous prime is 161018497. The next prime is 161018537. The reversal of 161018521 is 125810161.

It is a happy number.

161018521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161018521 - 2¹¹ = 161016473 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161018581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102571 + ... + 104128.

It is an arithmetic number, because the mean of its divisors is an integer number (21703500).

Almost surely, 2^161018521 is an apocalyptic number.

It is an amenable number.

161018521 is a deficient number, since it is larger than the sum of its proper divisors (12609479).

161018521 is a wasteful number, since it uses less digits than its factorization.

161018521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206759.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 161018521 is about 12689.3073491030. The cubic root of 161018521 is about 544.0330422999.

Adding to 161018521 its reverse (125810161), we get a palindrome (286828682).

The spelling of 161018521 in words is "one hundred sixty-one million, eighteen thousand, five hundred twenty-one".