147721457 has 12 divisors (see below), whose sum is σ = 160451676. Its totient is φ = 135195840.

The previous prime is 147721439. The next prime is 147721463. The reversal of 147721457 is 754127741.

It can be written as a sum of positive squares in 6 ways, for example, as 34000561 + 113720896 = 5831^2 + 10664^2 .

It is not a de Polignac number, because 147721457 - 2¹⁸ = 147459313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147721457.

It is not an unprimeable number, because it can be changed into a prime (147721477) 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 11 ways as a sum of consecutive naturals, for example, 320207 + ... + 320667.

It is an arithmetic number, because the mean of its divisors is an integer number (13370973).

Almost surely, 2^147721457 is an apocalyptic number.

It is an amenable number.

147721457 is a deficient number, since it is larger than the sum of its proper divisors (12730219).

147721457 is an equidigital number, since it uses as much as digits as its factorization.

147721457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 631 counting only the distinct ones).

The product of its digits is 54880, while the sum is 38.

The square root of 147721457 is about 12154.0716223001. The cubic root of 147721457 is about 528.6251980189.

The spelling of 147721457 in words is "one hundred forty-seven million, seven hundred twenty-one thousand, four hundred fifty-seven".