9090856501 has 2 divisors, whose sum is σ = 9090856502. Its totient is φ = 9090856500.

The previous prime is 9090856499. The next prime is 9090856517. The reversal of 9090856501 is 1056580909.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4859484100 + 4231372401 = 69710^2 + 65049^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090856501 - 2¹ = 9090856499 is a prime.

Together with 9090856499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9090856531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545428250 + 4545428251.

It is an arithmetic number, because the mean of its divisors is an integer number (4545428251).

Almost surely, 2^9090856501 is an apocalyptic number.

It is an amenable number.

9090856501 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090856501 is an equidigital number, since it uses as much as digits as its factorization.

9090856501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 9090856501 is about 95345.9831403505. The cubic root of 9090856501 is about 2087.0599979369.

The spelling of 9090856501 in words is "nine billion, ninety million, eight hundred fifty-six thousand, five hundred one".