505144030621 has 2 divisors, whose sum is σ = 505144030622. Its totient is φ = 505144030620.

The previous prime is 505144030619. The next prime is 505144030667. The reversal of 505144030621 is 126030441505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273200654596 + 231943376025 = 522686^2 + 481605^2 .

It is a cyclic number.

It is not a de Polignac number, because 505144030621 - 2¹ = 505144030619 is a prime.

Together with 505144030619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505144060621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252572015310 + 252572015311.

It is an arithmetic number, because the mean of its divisors is an integer number (252572015311).

Almost surely, 2^505144030621 is an apocalyptic number.

It is an amenable number.

505144030621 is a deficient number, since it is larger than the sum of its proper divisors (1).

505144030621 is an equidigital number, since it uses as much as digits as its factorization.

505144030621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 505144030621 in words is "five hundred five billion, one hundred forty-four million, thirty thousand, six hundred twenty-one".