461521421 has 2 divisors, whose sum is σ = 461521422. Its totient is φ = 461521420.

The previous prime is 461521331. The next prime is 461521433. The reversal of 461521421 is 124125164.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236821321 + 224700100 = 15389^2 + 14990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-461521421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (461529421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230760710 + 230760711.

It is an arithmetic number, because the mean of its divisors is an integer number (230760711).

Almost surely, 2^461521421 is an apocalyptic number.

It is an amenable number.

461521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

461521421 is an equidigital number, since it uses as much as digits as its factorization.

461521421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 461521421 is about 21483.0496205730. The cubic root of 461521421 is about 772.7943787170.

Adding to 461521421 its reverse (124125164), we get a palindrome (585646585).

The spelling of 461521421 in words is "four hundred sixty-one million, five hundred twenty-one thousand, four hundred twenty-one".