9090990497 has 2 divisors, whose sum is σ = 9090990498. Its totient is φ = 9090990496.

The previous prime is 9090990487. The next prime is 9090990563. The reversal of 9090990497 is 7940990909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7561867681 + 1529122816 = 86959^2 + 39104^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090990497 - 2⁴ = 9090990481 is a prime.

It is a super-2 number, since 2×9090990497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9090990407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545495248 + 4545495249.

It is an arithmetic number, because the mean of its divisors is an integer number (4545495249).

Almost surely, 2^9090990497 is an apocalyptic number.

It is an amenable number.

9090990497 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090990497 is an equidigital number, since it uses as much as digits as its factorization.

9090990497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1653372, while the sum is 56.

The square root of 9090990497 is about 95346.6858207458. The cubic root of 9090990497 is about 2087.0702520612.

The spelling of 9090990497 in words is "nine billion, ninety million, nine hundred ninety thousand, four hundred ninety-seven".