999950881 has 2 divisors, whose sum is σ = 999950882. Its totient is φ = 999950880.

The previous prime is 999950879. The next prime is 999950891. The reversal of 999950881 is 188059999.

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., 603144481 + 396806400 = 24559^2 + 19920^2 .

It is a cyclic number.

It is not a de Polignac number, because 999950881 - 2¹ = 999950879 is a prime.

It is a super-2 number, since 2×999950881² = 1999803528825352322, which contains 22 as substring.

Together with 999950879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (999950801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499975440 + 499975441.

It is an arithmetic number, because the mean of its divisors is an integer number (499975441).

Almost surely, 2^999950881 is an apocalyptic number.

It is an amenable number.

999950881 is a deficient number, since it is larger than the sum of its proper divisors (1).

999950881 is an equidigital number, since it uses as much as digits as its factorization.

999950881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 58.

The square root of 999950881 is about 31621.9999525647. Note that the first 4 decimals coincide. The cubic root of 999950881 is about 999.9836267319.

The spelling of 999950881 in words is "nine hundred ninety-nine million, nine hundred fifty thousand, eight hundred eighty-one".