505010099981 has 2 divisors, whose sum is σ = 505010099982. Its totient is φ = 505010099980.

The previous prime is 505010099863. The next prime is 505010100047. The reversal of 505010099981 is 189990010505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496130053225 + 8880046756 = 704365^2 + 94234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505010099981 is a prime.

It is a super-2 number, since 2×505010099981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505010099281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252505049990 + 252505049991.

It is an arithmetic number, because the mean of its divisors is an integer number (252505049991).

Almost surely, 2^505010099981 is an apocalyptic number.

It is an amenable number.

505010099981 is a deficient number, since it is larger than the sum of its proper divisors (1).

505010099981 is an equidigital number, since it uses as much as digits as its factorization.

505010099981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 47.

The spelling of 505010099981 in words is "five hundred five billion, ten million, ninety-nine thousand, nine hundred eighty-one".