487105721 has 8 divisors (see below), whose sum is σ = 505870920. Its totient is φ = 468471808.

The previous prime is 487105699. The next prime is 487105733. The reversal of 487105721 is 127501784.

It can be written as a sum of positive squares in 4 ways, for example, as 351150121 + 135955600 = 18739^2 + 11660^2 .

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 487105721 - 2⁶ = 487105657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (487105771) 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 7 ways as a sum of consecutive naturals, for example, 25226 + ... + 40131.

It is an arithmetic number, because the mean of its divisors is an integer number (63233865).

Almost surely, 2^487105721 is an apocalyptic number.

It is an amenable number.

487105721 is a deficient number, since it is larger than the sum of its proper divisors (18765199).

487105721 is a wasteful number, since it uses less digits than its factorization.

487105721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65643.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 487105721 is about 22070.4716986294. The cubic root of 487105721 is about 786.8182235965.

The spelling of 487105721 in words is "four hundred eighty-seven million, one hundred five thousand, seven hundred twenty-one".