90143887 has 2 divisors, whose sum is σ = 90143888. Its totient is φ = 90143886.

The previous prime is 90143873. The next prime is 90143891. The reversal of 90143887 is 78834109.

It is a strong prime.

It is an emirp because it is prime and its reverse (78834109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90143887 - 2²³ = 81755279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90143897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45071943 + 45071944.

It is an arithmetic number, because the mean of its divisors is an integer number (45071944).

Almost surely, 2^90143887 is an apocalyptic number.

90143887 is a deficient number, since it is larger than the sum of its proper divisors (1).

90143887 is an equidigital number, since it uses as much as digits as its factorization.

90143887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 90143887 is about 9494.4134626632. The cubic root of 90143887 is about 448.3791681956.

The spelling of 90143887 in words is "ninety million, one hundred forty-three thousand, eight hundred eighty-seven".