90311791 has 2 divisors, whose sum is σ = 90311792. Its totient is φ = 90311790.

The previous prime is 90311789. The next prime is 90311801. The reversal of 90311791 is 19711309.

It is a weak prime.

It is an emirp because it is prime and its reverse (19711309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90311791 - 2¹ = 90311789 is a prime.

Together with 90311789, 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 (90311491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45155895 + 45155896.

It is an arithmetic number, because the mean of its divisors is an integer number (45155896).

Almost surely, 2^90311791 is an apocalyptic number.

90311791 is a deficient number, since it is larger than the sum of its proper divisors (1).

90311791 is an equidigital number, since it uses as much as digits as its factorization.

90311791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 90311791 is about 9503.2516014257. The cubic root of 90311791 is about 448.6573825201.

The spelling of 90311791 in words is "ninety million, three hundred eleven thousand, seven hundred ninety-one".