147315721 has 16 divisors (see below), whose sum is σ = 181350400. Its totient is φ = 116838288.

The previous prime is 147315709. The next prime is 147315757. The reversal of 147315721 is 127513741.

It is not a de Polignac number, because 147315721 - 2⁷ = 147315593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (147315121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7161 + ... + 18598.

It is an arithmetic number, because the mean of its divisors is an integer number (11334400).

Almost surely, 2^147315721 is an apocalyptic number.

It is an amenable number.

147315721 is a deficient number, since it is larger than the sum of its proper divisors (34034679).

147315721 is a wasteful number, since it uses less digits than its factorization.

147315721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25828.

The product of its digits is 5880, while the sum is 31.

The square root of 147315721 is about 12137.3687840487. The cubic root of 147315721 is about 528.1407751832.

The spelling of 147315721 in words is "one hundred forty-seven million, three hundred fifteen thousand, seven hundred twenty-one".