90381869 has 2 divisors, whose sum is σ = 90381870. Its totient is φ = 90381868.

The previous prime is 90381859. The next prime is 90381871. The reversal of 90381869 is 96818309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73324969 + 17056900 = 8563^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 90381869 - 2¹⁶ = 90316333 is a prime.

It is a super-2 number, since 2×90381869² = 16337764487866322, which contains 22 as substring.

Together with 90381871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90381839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45190934 + 45190935.

It is an arithmetic number, because the mean of its divisors is an integer number (45190935).

Almost surely, 2^90381869 is an apocalyptic number.

It is an amenable number.

90381869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90381869 is an equidigital number, since it uses as much as digits as its factorization.

90381869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 90381869 is about 9506.9379402624. The cubic root of 90381869 is about 448.7733986863.

The spelling of 90381869 in words is "ninety million, three hundred eighty-one thousand, eight hundred sixty-nine".