841485721 has 4 divisors (see below), whose sum is σ = 870502500. Its totient is φ = 812468944.

The previous prime is 841485719. The next prime is 841485739. The reversal of 841485721 is 127584148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 410508121 + 430977600 = 20261^2 + 20760^2 .

It is a cyclic number.

It is not a de Polignac number, because 841485721 - 2¹ = 841485719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (841485761) 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, 14508346 + ... + 14508403.

It is an arithmetic number, because the mean of its divisors is an integer number (217625625).

Almost surely, 2^841485721 is an apocalyptic number.

It is an amenable number.

841485721 is a deficient number, since it is larger than the sum of its proper divisors (29016779).

841485721 is a wasteful number, since it uses less digits than its factorization.

841485721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29016778.

The product of its digits is 71680, while the sum is 40.

The square root of 841485721 is about 29008.3732911723. The cubic root of 841485721 is about 944.0947523062.

The spelling of 841485721 in words is "eight hundred forty-one million, four hundred eighty-five thousand, seven hundred twenty-one".