461539451521 has 4 divisors (see below), whose sum is σ = 461541182292. Its totient is φ = 461537720752.

The previous prime is 461539451519. The next prime is 461539451543. The reversal of 461539451521 is 125154935164.

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 170436039921 + 291103411600 = 412839^2 + 539540^2 .

It is a cyclic number.

It is not a de Polignac number, because 461539451521 - 2¹ = 461539451519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491539451521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371386 + ... + 1030051.

It is an arithmetic number, because the mean of its divisors is an integer number (115385295573).

Almost surely, 2^461539451521 is an apocalyptic number.

It is an amenable number.

461539451521 is a deficient number, since it is larger than the sum of its proper divisors (1730771).

461539451521 is a wasteful number, since it uses less digits than its factorization.

461539451521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730770.

The product of its digits is 648000, while the sum is 46.

The spelling of 461539451521 in words is "four hundred sixty-one billion, five hundred thirty-nine million, four hundred fifty-one thousand, five hundred twenty-one".