9091819123 has 2 divisors, whose sum is σ = 9091819124. Its totient is φ = 9091819122.

The previous prime is 9091819081. The next prime is 9091819133. The reversal of 9091819123 is 3219181909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9091819123 is a prime.

It is a super-2 number, since 2×9091819123² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9091819123.

It is not a weakly prime, because it can be changed into another prime (9091819133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545909561 + 4545909562.

It is an arithmetic number, because the mean of its divisors is an integer number (4545909562).

Almost surely, 2^9091819123 is an apocalyptic number.

9091819123 is a deficient number, since it is larger than the sum of its proper divisors (1).

9091819123 is an equidigital number, since it uses as much as digits as its factorization.

9091819123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 9091819123 is about 95351.0310536808. The cubic root of 9091819123 is about 2087.1336609249.

The spelling of 9091819123 in words is "nine billion, ninety-one million, eight hundred nineteen thousand, one hundred twenty-three".