505213125961 has 2 divisors, whose sum is σ = 505213125962. Its totient is φ = 505213125960.

The previous prime is 505213125959. The next prime is 505213126037. The reversal of 505213125961 is 169521312505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494147137936 + 11065988025 = 702956^2 + 105195^2 .

It is a cyclic number.

It is not a de Polignac number, because 505213125961 - 2¹ = 505213125959 is a prime.

Together with 505213125959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (505213125931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252606562980 + 252606562981.

It is an arithmetic number, because the mean of its divisors is an integer number (252606562981).

Almost surely, 2^505213125961 is an apocalyptic number.

It is an amenable number.

505213125961 is a deficient number, since it is larger than the sum of its proper divisors (1).

505213125961 is an equidigital number, since it uses as much as digits as its factorization.

505213125961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 505213125961 in words is "five hundred five billion, two hundred thirteen million, one hundred twenty-five thousand, nine hundred sixty-one".