160345721 has 4 divisors (see below), whose sum is σ = 160383744. Its totient is φ = 160307700.

The previous prime is 160345699. The next prime is 160345739. The reversal of 160345721 is 127543061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127543061 = 17 ⋅7502533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160345721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160345771) 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, 11765 + ... + 21426.

It is an arithmetic number, because the mean of its divisors is an integer number (40095936).

Almost surely, 2^160345721 is an apocalyptic number.

It is an amenable number.

160345721 is a deficient number, since it is larger than the sum of its proper divisors (38023).

160345721 is an equidigital number, since it uses as much as digits as its factorization.

160345721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38022.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 160345721 is about 12662.7690889473. The cubic root of 160345721 is about 543.2742550173.

Adding to 160345721 its reverse (127543061), we get a palindrome (287888782).

The spelling of 160345721 in words is "one hundred sixty million, three hundred forty-five thousand, seven hundred twenty-one".