999722617 has 2 divisors, whose sum is σ = 999722618. Its totient is φ = 999722616.

The previous prime is 999722599. The next prime is 999722653. The reversal of 999722617 is 716227999.

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., 521163241 + 478559376 = 22829^2 + 21876^2 .

It is a cyclic number.

It is not a de Polignac number, because 999722617 - 2⁷ = 999722489 is a prime.

It is not a weakly prime, because it can be changed into another prime (999722657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499861308 + 499861309.

It is an arithmetic number, because the mean of its divisors is an integer number (499861309).

Almost surely, 2^999722617 is an apocalyptic number.

It is an amenable number.

999722617 is a deficient number, since it is larger than the sum of its proper divisors (1).

999722617 is an equidigital number, since it uses as much as digits as its factorization.

999722617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 999722617 is about 31618.3904871832. The cubic root of 999722617 is about 999.9075304496.

The spelling of 999722617 in words is "nine hundred ninety-nine million, seven hundred twenty-two thousand, six hundred seventeen".