160472721 has 4 divisors (see below), whose sum is σ = 213963632. Its totient is φ = 106981812.

The previous prime is 160472701. The next prime is 160472749. The reversal of 160472721 is 127274061.

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: 127274061 = 3 ⋅42424687.

It is not a de Polignac number, because 160472721 - 2⁶ = 160472657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160472701) 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, 26745451 + ... + 26745456.

It is an arithmetic number, because the mean of its divisors is an integer number (53490908).

Almost surely, 2^160472721 is an apocalyptic number.

It is an amenable number.

160472721 is a deficient number, since it is larger than the sum of its proper divisors (53490911).

160472721 is an equidigital number, since it uses as much as digits as its factorization.

160472721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53490910.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 160472721 is about 12667.7827973170. The cubic root of 160472721 is about 543.4176485593.

The spelling of 160472721 in words is "one hundred sixty million, four hundred seventy-two thousand, seven hundred twenty-one".