999775013 has 2 divisors, whose sum is σ = 999775014. Its totient is φ = 999775012.

The previous prime is 999775009. The next prime is 999775019. The reversal of 999775013 is 310577999.

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., 988599364 + 11175649 = 31442^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 999775013 - 2² = 999775009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999775019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499887506 + 499887507.

It is an arithmetic number, because the mean of its divisors is an integer number (499887507).

Almost surely, 2^999775013 is an apocalyptic number.

It is an amenable number.

999775013 is a deficient number, since it is larger than the sum of its proper divisors (1).

999775013 is an equidigital number, since it uses as much as digits as its factorization.

999775013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 535815, while the sum is 50.

The square root of 999775013 is about 31619.2190447519. The cubic root of 999775013 is about 999.9249987083.

The spelling of 999775013 in words is "nine hundred ninety-nine million, seven hundred seventy-five thousand, thirteen".