99991049 has 2 divisors, whose sum is σ = 99991050. Its totient is φ = 99991048.

The previous prime is 99991033. The next prime is 99991063. The reversal of 99991049 is 94019999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87516025 + 12475024 = 9355^2 + 3532^2 .

It is a cyclic number.

It is not a de Polignac number, because 99991049 - 2⁴ = 99991033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99990988 and 99991006.

It is not a weakly prime, because it can be changed into another prime (99991009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995524 + 49995525.

It is an arithmetic number, because the mean of its divisors is an integer number (49995525).

Almost surely, 2^99991049 is an apocalyptic number.

It is an amenable number.

99991049 is a deficient number, since it is larger than the sum of its proper divisors (1).

99991049 is an equidigital number, since it uses as much as digits as its factorization.

99991049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 99991049 is about 9999.5524399845. The cubic root of 99991049 is about 464.1450339942.

The spelling of 99991049 in words is "ninety-nine million, nine hundred ninety-one thousand, forty-nine".