147275721 has 12 divisors (see below), whose sum is σ = 213803200. Its totient is φ = 97689240.

The previous prime is 147275719. The next prime is 147275729. The reversal of 147275721 is 127572741.

147275721 is a `hidden beast` number, since 14 + 72 + 7 + 572 + 1 = 666.

It is not a de Polignac number, because 147275721 - 2¹ = 147275719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (147275729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39325 + ... + 42906.

Almost surely, 2^147275721 is an apocalyptic number.

It is an amenable number.

147275721 is a deficient number, since it is larger than the sum of its proper divisors (66527479).

147275721 is a wasteful number, since it uses less digits than its factorization.

147275721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82436 (or 82433 counting only the distinct ones).

The product of its digits is 27440, while the sum is 36.

The square root of 147275721 is about 12135.7208685764. The cubic root of 147275721 is about 528.0929695967.

The spelling of 147275721 in words is "one hundred forty-seven million, two hundred seventy-five thousand, seven hundred twenty-one".