160689521 has 4 divisors (see below), whose sum is σ = 162346212. Its totient is φ = 159032832.

The previous prime is 160689469. The next prime is 160689527. The reversal of 160689521 is 125986061.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65431921 + 95257600 = 8089^2 + 9760^2 .

It is a cyclic number.

It is not a de Polignac number, because 160689521 - 2²⁶ = 93580657 is a prime.

It is a super-2 number, since 2×160689521² = 51642244318418882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160689527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828200 + ... + 828393.

It is an arithmetic number, because the mean of its divisors is an integer number (40586553).

Almost surely, 2^160689521 is an apocalyptic number.

It is an amenable number.

160689521 is a deficient number, since it is larger than the sum of its proper divisors (1656691).

160689521 is an equidigital number, since it uses as much as digits as its factorization.

160689521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656690.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 160689521 is about 12676.3370497948. The cubic root of 160689521 is about 543.6622590447.

The spelling of 160689521 in words is "one hundred sixty million, six hundred eighty-nine thousand, five hundred twenty-one".