8970909721 has 2 divisors, whose sum is σ = 8970909722. Its totient is φ = 8970909720.

The previous prime is 8970909671. The next prime is 8970909743. The reversal of 8970909721 is 1279090798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8948214025 + 22695696 = 94595^2 + 4764^2 .

It is a cyclic number.

It is not a de Polignac number, because 8970909721 - 2⁹ = 8970909209 is a prime.

It is not a weakly prime, because it can be changed into another prime (8970909781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4485454860 + 4485454861.

It is an arithmetic number, because the mean of its divisors is an integer number (4485454861).

Almost surely, 2^8970909721 is an apocalyptic number.

It is an amenable number.

8970909721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8970909721 is an equidigital number, since it uses as much as digits as its factorization.

8970909721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 8970909721 is about 94714.8864804261. The cubic root of 8970909721 is about 2077.8402848718.

The spelling of 8970909721 in words is "eight billion, nine hundred seventy million, nine hundred nine thousand, seven hundred twenty-one".