821752879 has 2 divisors, whose sum is σ = 821752880. Its totient is φ = 821752878.

The previous prime is 821752829. The next prime is 821752949. The reversal of 821752879 is 978257128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821752879 - 2¹⁵ = 821720111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821752829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410876439 + 410876440.

It is an arithmetic number, because the mean of its divisors is an integer number (410876440).

Almost surely, 2^821752879 is an apocalyptic number.

821752879 is a deficient number, since it is larger than the sum of its proper divisors (1).

821752879 is an equidigital number, since it uses as much as digits as its factorization.

821752879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 821752879 is about 28666.2323823693. The cubic root of 821752879 is about 936.6566297196.

The spelling of 821752879 in words is "eight hundred twenty-one million, seven hundred fifty-two thousand, eight hundred seventy-nine".