160257521 has 4 divisors (see below), whose sum is σ = 169684452. Its totient is φ = 150830592.

The previous prime is 160257499. The next prime is 160257527. The reversal of 160257521 is 125752061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125752061 = 97 ⋅1296413.

It can be written as a sum of positive squares in 2 ways, for example, as 144961600 + 15295921 = 12040^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 160257521 - 2¹⁸ = 159995377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160257527) 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, 4713440 + ... + 4713473.

It is an arithmetic number, because the mean of its divisors is an integer number (42421113).

Almost surely, 2^160257521 is an apocalyptic number.

It is an amenable number.

160257521 is a deficient number, since it is larger than the sum of its proper divisors (9426931).

160257521 is an equidigital number, since it uses as much as digits as its factorization.

160257521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426930.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 160257521 is about 12659.2859593265. The cubic root of 160257521 is about 543.1746253392.

The spelling of 160257521 in words is "one hundred sixty million, two hundred fifty-seven thousand, five hundred twenty-one".