999953287 has 2 divisors, whose sum is σ = 999953288. Its totient is φ = 999953286.

The previous prime is 999953191. The next prime is 999953293. The reversal of 999953287 is 782359999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999953287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999953587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499976643 + 499976644.

It is an arithmetic number, because the mean of its divisors is an integer number (499976644).

Almost surely, 2^999953287 is an apocalyptic number.

999953287 is a deficient number, since it is larger than the sum of its proper divisors (1).

999953287 is an equidigital number, since it uses as much as digits as its factorization.

999953287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 61.

The square root of 999953287 is about 31622.0379956764. The cubic root of 999953287 is about 999.9844287575.

The spelling of 999953287 in words is "nine hundred ninety-nine million, nine hundred fifty-three thousand, two hundred eighty-seven".