999938005961 has 2 divisors, whose sum is σ = 999938005962. Its totient is φ = 999938005960.

The previous prime is 999938005939. The next prime is 999938006107. The reversal of 999938005961 is 169500839999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 813344244736 + 186593761225 = 901856^2 + 431965^2 .

It is a cyclic number.

It is not a de Polignac number, because 999938005961 - 2¹⁴ = 999937989577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999938005891 and 999938005900.

It is not a weakly prime, because it can be changed into another prime (999938005901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499969002980 + 499969002981.

It is an arithmetic number, because the mean of its divisors is an integer number (499969002981).

Almost surely, 2^999938005961 is an apocalyptic number.

It is an amenable number.

999938005961 is a deficient number, since it is larger than the sum of its proper divisors (1).

999938005961 is an equidigital number, since it uses as much as digits as its factorization.

999938005961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42515280, while the sum is 68.

The spelling of 999938005961 in words is "nine hundred ninety-nine billion, nine hundred thirty-eight million, five thousand, nine hundred sixty-one".