887429821 has 2 divisors, whose sum is σ = 887429822. Its totient is φ = 887429820.

The previous prime is 887429819. The next prime is 887429833. The reversal of 887429821 is 128924788.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857025625 + 30404196 = 29275^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 887429821 - 2¹ = 887429819 is a prime.

Together with 887429819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (887429321) 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, 443714910 + 443714911.

It is an arithmetic number, because the mean of its divisors is an integer number (443714911).

Almost surely, 2^887429821 is an apocalyptic number.

It is an amenable number.

887429821 is a deficient number, since it is larger than the sum of its proper divisors (1).

887429821 is an equidigital number, since it uses as much as digits as its factorization.

887429821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The square root of 887429821 is about 29789.7603380759. The cubic root of 887429821 is about 960.9733404189.

The spelling of 887429821 in words is "eight hundred eighty-seven million, four hundred twenty-nine thousand, eight hundred twenty-one".