161579681 has 8 divisors (see below), whose sum is σ = 166334784. Its totient is φ = 156870000.

The previous prime is 161579653. The next prime is 161579683. The reversal of 161579681 is 186975161.

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 161579681 - 2⁶ = 161579617 is a prime.

It is a super-2 number, since 2×161579681² = 52215986624123522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161579683) 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, 4070 + ... + 18431.

It is an arithmetic number, because the mean of its divisors is an integer number (20791848).

Almost surely, 2^161579681 is an apocalyptic number.

It is an amenable number.

161579681 is a deficient number, since it is larger than the sum of its proper divisors (4755103).

161579681 is a wasteful number, since it uses less digits than its factorization.

161579681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22711.

The product of its digits is 90720, while the sum is 44.

The square root of 161579681 is about 12711.3996475605. The cubic root of 161579681 is about 544.6643063595.

The spelling of 161579681 in words is "one hundred sixty-one million, five hundred seventy-nine thousand, six hundred eighty-one".