507489840721 has 4 divisors (see below), whose sum is σ = 507509165412. Its totient is φ = 507470516032.

The previous prime is 507489840701. The next prime is 507489840733. The reversal of 507489840721 is 127048984705.

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 115913011600 + 391576829121 = 340460^2 + 625761^2 .

It is a cyclic number.

It is not a de Polignac number, because 507489840721 - 2¹⁵ = 507489807953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (507489840701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9622900 + ... + 9675493.

It is an arithmetic number, because the mean of its divisors is an integer number (126877291353).

Almost surely, 2^507489840721 is an apocalyptic number.

It is an amenable number.

507489840721 is a deficient number, since it is larger than the sum of its proper divisors (19324691).

507489840721 is a wasteful number, since it uses less digits than its factorization.

507489840721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19324690.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 507489840721 in words is "five hundred seven billion, four hundred eighty-nine million, eight hundred forty thousand, seven hundred twenty-one".