9162801721 has 2 divisors, whose sum is σ = 9162801722. Its totient is φ = 9162801720.

The previous prime is 9162801671. The next prime is 9162801757. The reversal of 9162801721 is 1271082619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4837898025 + 4324903696 = 69555^2 + 65764^2 .

It is an emirp because it is prime and its reverse (1271082619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9162801721 - 2²⁵ = 9129247289 is a prime.

It is not a weakly prime, because it can be changed into another prime (9162801761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4581400860 + 4581400861.

It is an arithmetic number, because the mean of its divisors is an integer number (4581400861).

Almost surely, 2^9162801721 is an apocalyptic number.

It is an amenable number.

9162801721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9162801721 is an equidigital number, since it uses as much as digits as its factorization.

9162801721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 9162801721 is about 95722.5246271744. The cubic root of 9162801721 is about 2092.5512156192.

The spelling of 9162801721 in words is "nine billion, one hundred sixty-two million, eight hundred one thousand, seven hundred twenty-one".