999998501 has 2 divisors, whose sum is σ = 999998502. Its totient is φ = 999998500.

The previous prime is 999998459. The next prime is 999998507. The reversal of 999998501 is 105899999.

999998501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808037476 + 191961025 = 28426^2 + 13855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999998501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999250 + 499999251.

It is an arithmetic number, because the mean of its divisors is an integer number (499999251).

Almost surely, 2^999998501 is an apocalyptic number.

It is an amenable number.

999998501 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998501 is an equidigital number, since it uses as much as digits as its factorization.

999998501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The square root of 999998501 is about 31622.7529004038. The cubic root of 999998501 is about 999.9995003331. Note that the first 3 decimals are identical.

The spelling of 999998501 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred one".