860884721 has 2 divisors, whose sum is σ = 860884722. Its totient is φ = 860884720.

The previous prime is 860884697. The next prime is 860884723. The reversal of 860884721 is 127488068.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706230625 + 154654096 = 26575^2 + 12436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-860884721 is a prime.

It is a super-2 number, since 2×860884721² = 1482245005702495682, which contains 22 as substring.

Together with 860884723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (860884723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430442360 + 430442361.

It is an arithmetic number, because the mean of its divisors is an integer number (430442361).

Almost surely, 2^860884721 is an apocalyptic number.

It is an amenable number.

860884721 is a deficient number, since it is larger than the sum of its proper divisors (1).

860884721 is an equidigital number, since it uses as much as digits as its factorization.

860884721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 860884721 is about 29340.8370875815. The cubic root of 860884721 is about 951.2945310325.

It can be divided in two parts, 86088 and 4721, that added together give a palindrome (90809).

The spelling of 860884721 in words is "eight hundred sixty million, eight hundred eighty-four thousand, seven hundred twenty-one".