8864151721 has 2 divisors, whose sum is σ = 8864151722. Its totient is φ = 8864151720.

The previous prime is 8864151701. The next prime is 8864151761. The reversal of 8864151721 is 1271514688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6040398400 + 2823753321 = 77720^2 + 53139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8864151721 - 2⁵ = 8864151689 is a prime.

It is a super-3 number, since 3×8864151721³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8864151701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4432075860 + 4432075861.

It is an arithmetic number, because the mean of its divisors is an integer number (4432075861).

Almost surely, 2^8864151721 is an apocalyptic number.

It is an amenable number.

8864151721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8864151721 is an equidigital number, since it uses as much as digits as its factorization.

8864151721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 43.

The square root of 8864151721 is about 94149.6241150224. The cubic root of 8864151721 is about 2069.5649486739.

The spelling of 8864151721 in words is "eight billion, eight hundred sixty-four million, one hundred fifty-one thousand, seven hundred twenty-one".