870004781 has 2 divisors, whose sum is σ = 870004782. Its totient is φ = 870004780.

The previous prime is 870004777. The next prime is 870004823. The reversal of 870004781 is 187400078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817674025 + 52330756 = 28595^2 + 7234^2 .

It is a cyclic number.

It is not a de Polignac number, because 870004781 - 2² = 870004777 is a prime.

It is a super-2 number, since 2×870004781² = 1513816637925715922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870004711) 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, 435002390 + 435002391.

It is an arithmetic number, because the mean of its divisors is an integer number (435002391).

Almost surely, 2^870004781 is an apocalyptic number.

It is an amenable number.

870004781 is a deficient number, since it is larger than the sum of its proper divisors (1).

870004781 is an equidigital number, since it uses as much as digits as its factorization.

870004781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 870004781 is about 29495.8434529342. The cubic root of 870004781 is about 954.6420196436.

The spelling of 870004781 in words is "eight hundred seventy million, four thousand, seven hundred eighty-one".