90203873 has 2 divisors, whose sum is σ = 90203874. Its totient is φ = 90203872.

The previous prime is 90203851. The next prime is 90203899. The reversal of 90203873 is 37830209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90003169 + 200704 = 9487^2 + 448^2 .

It is an emirp because it is prime and its reverse (37830209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90203873 - 2²² = 86009569 is a prime.

It is equal to p_5228186 and since 90203873 and 5228186 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (90203473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45101936 + 45101937.

It is an arithmetic number, because the mean of its divisors is an integer number (45101937).

Almost surely, 2^90203873 is an apocalyptic number.

It is an amenable number.

90203873 is a deficient number, since it is larger than the sum of its proper divisors (1).

90203873 is an equidigital number, since it uses as much as digits as its factorization.

90203873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 90203873 is about 9497.5719528730. The cubic root of 90203873 is about 448.4786037012.

The spelling of 90203873 in words is "ninety million, two hundred three thousand, eight hundred seventy-three".