363145721 has 8 divisors (see below), whose sum is σ = 388829160. Its totient is φ = 337942528.

The previous prime is 363145711. The next prime is 363145723. The reversal of 363145721 is 127541363.

It can be written as a sum of positive squares in 4 ways, for example, as 44023225 + 319122496 = 6635^2 + 17864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 363145721 - 2¹⁰ = 363144697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (363145723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118496 + ... + 121521.

It is an arithmetic number, because the mean of its divisors is an integer number (48603645).

Almost surely, 2^363145721 is an apocalyptic number.

It is an amenable number.

363145721 is a deficient number, since it is larger than the sum of its proper divisors (25683439).

363145721 is a wasteful number, since it uses less digits than its factorization.

363145721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240123.

The product of its digits is 15120, while the sum is 32.

The square root of 363145721 is about 19056.3826840248. The cubic root of 363145721 is about 713.4446907169. Note that the first 3 decimals are identical.

The spelling of 363145721 in words is "three hundred sixty-three million, one hundred forty-five thousand, seven hundred twenty-one".