999245251 has 2 divisors, whose sum is σ = 999245252. Its totient is φ = 999245250.

The previous prime is 999245197. The next prime is 999245263. The reversal of 999245251 is 152542999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999245251 - 2⁷ = 999245123 is a prime.

It is not a weakly prime, because it can be changed into another prime (999245651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499622625 + 499622626.

It is an arithmetic number, because the mean of its divisors is an integer number (499622626).

Almost surely, 2^999245251 is an apocalyptic number.

999245251 is a deficient number, since it is larger than the sum of its proper divisors (1).

999245251 is an equidigital number, since it uses as much as digits as its factorization.

999245251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 46.

The square root of 999245251 is about 31610.8407196012. The cubic root of 999245251 is about 999.7483536794.

The spelling of 999245251 in words is "nine hundred ninety-nine million, two hundred forty-five thousand, two hundred fifty-one".