90381871 has 2 divisors, whose sum is σ = 90381872. Its totient is φ = 90381870.

The previous prime is 90381869. The next prime is 90381883. The reversal of 90381871 is 17818309.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90381871 - 2¹ = 90381869 is a prime.

Together with 90381869, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90381871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90381821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45190935 + 45190936.

It is an arithmetic number, because the mean of its divisors is an integer number (45190936).

Almost surely, 2^90381871 is an apocalyptic number.

90381871 is a deficient number, since it is larger than the sum of its proper divisors (1).

90381871 is an equidigital number, since it uses as much as digits as its factorization.

90381871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 90381871 is about 9506.9380454487. The cubic root of 90381871 is about 448.7734019965.

The spelling of 90381871 in words is "ninety million, three hundred eighty-one thousand, eight hundred seventy-one".