999779597 has 2 divisors, whose sum is σ = 999779598. Its totient is φ = 999779596.

The previous prime is 999779579. The next prime is 999779609. The reversal of 999779597 is 795977999.

Together with previous prime (999779579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740601796 + 259177801 = 27214^2 + 16099^2 .

It is a cyclic number.

It is not a de Polignac number, because 999779597 - 2⁶ = 999779533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999779597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999779527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499889798 + 499889799.

It is an arithmetic number, because the mean of its divisors is an integer number (499889799).

Almost surely, 2^999779597 is an apocalyptic number.

It is an amenable number.

999779597 is a deficient number, since it is larger than the sum of its proper divisors (1).

999779597 is an equidigital number, since it uses as much as digits as its factorization.

999779597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101269035, while the sum is 71.

The square root of 999779597 is about 31619.2915322276. The cubic root of 999779597 is about 999.9265269352.

The spelling of 999779597 in words is "nine hundred ninety-nine million, seven hundred seventy-nine thousand, five hundred ninety-seven".