999950328781 has 2 divisors, whose sum is σ = 999950328782. Its totient is φ = 999950328780.

The previous prime is 999950328703. The next prime is 999950328803. The reversal of 999950328781 is 187823059999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879309421225 + 120640907556 = 937715^2 + 347334^2 .

It is a cyclic number.

It is not a de Polignac number, because 999950328781 - 2¹¹ = 999950326733 is a prime.

It is a super-2 number, since 2×999950328781² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999950328781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999950320781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499975164390 + 499975164391.

It is an arithmetic number, because the mean of its divisors is an integer number (499975164391).

Almost surely, 2^999950328781 is an apocalyptic number.

It is an amenable number.

999950328781 is a deficient number, since it is larger than the sum of its proper divisors (1).

999950328781 is an equidigital number, since it uses as much as digits as its factorization.

999950328781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 70.

The spelling of 999950328781 in words is "nine hundred ninety-nine billion, nine hundred fifty million, three hundred twenty-eight thousand, seven hundred eighty-one".