9100782721 has 2 divisors, whose sum is σ = 9100782722. Its totient is φ = 9100782720.

The previous prime is 9100782689. The next prime is 9100782739. The reversal of 9100782721 is 1272870019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9075229696 + 25553025 = 95264^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 9100782721 - 2⁵ = 9100782689 is a prime.

It is a super-2 number, since 2×9100782721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9100782221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4550391360 + 4550391361.

It is an arithmetic number, because the mean of its divisors is an integer number (4550391361).

Almost surely, 2^9100782721 is an apocalyptic number.

It is an amenable number.

9100782721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9100782721 is an equidigital number, since it uses as much as digits as its factorization.

9100782721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 9100782721 is about 95398.0226262578. The cubic root of 9100782721 is about 2087.8193353058.

The spelling of 9100782721 in words is "nine billion, one hundred million, seven hundred eighty-two thousand, seven hundred twenty-one".