999948251 has 2 divisors, whose sum is σ = 999948252. Its totient is φ = 999948250.

The previous prime is 999948223. The next prime is 999948259. The reversal of 999948251 is 152849999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999948251 is a prime.

It is not a weakly prime, because it can be changed into another prime (999948259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499974125 + 499974126.

It is an arithmetic number, because the mean of its divisors is an integer number (499974126).

Almost surely, 2^999948251 is an apocalyptic number.

999948251 is a deficient number, since it is larger than the sum of its proper divisors (1).

999948251 is an equidigital number, since it uses as much as digits as its factorization.

999948251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 56.

The square root of 999948251 is about 31621.9583675648. The cubic root of 999948251 is about 999.9827500358.

The spelling of 999948251 in words is "nine hundred ninety-nine million, nine hundred forty-eight thousand, two hundred fifty-one".