828251987 has 2 divisors, whose sum is σ = 828251988. Its totient is φ = 828251986.

The previous prime is 828251981. The next prime is 828251999. The reversal of 828251987 is 789152828.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 828251987 - 2¹⁶ = 828186451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (828251981) 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, 414125993 + 414125994.

It is an arithmetic number, because the mean of its divisors is an integer number (414125994).

Almost surely, 2^828251987 is an apocalyptic number.

828251987 is a deficient number, since it is larger than the sum of its proper divisors (1).

828251987 is an equidigital number, since it uses as much as digits as its factorization.

828251987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

The square root of 828251987 is about 28779.3673835962. The cubic root of 828251987 is about 939.1194360476.

The spelling of 828251987 in words is "eight hundred twenty-eight million, two hundred fifty-one thousand, nine hundred eighty-seven".