90985801811 has 2 divisors, whose sum is σ = 90985801812. Its totient is φ = 90985801810.

The previous prime is 90985801799. The next prime is 90985801853. The reversal of 90985801811 is 11810858909.

It is a weak prime.

It is an emirp because it is prime and its reverse (11810858909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90985801811 - 2¹⁴ = 90985785427 is a prime.

It is a super-2 number, since 2×90985801811² (a number of 23 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 90985801811.

It is not a weakly prime, because it can be changed into another prime (90985801861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45492900905 + 45492900906.

It is an arithmetic number, because the mean of its divisors is an integer number (45492900906).

Almost surely, 2^90985801811 is an apocalyptic number.

90985801811 is a deficient number, since it is larger than the sum of its proper divisors (1).

90985801811 is an equidigital number, since it uses as much as digits as its factorization.

90985801811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 50.

The spelling of 90985801811 in words is "ninety billion, nine hundred eighty-five million, eight hundred one thousand, eight hundred eleven".