90281231 has 2 divisors, whose sum is σ = 90281232. Its totient is φ = 90281230.

The previous prime is 90281201. The next prime is 90281249. The reversal of 90281231 is 13218209.

It is a strong prime.

It is an emirp because it is prime and its reverse (13218209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90281231 - 2²⁶ = 23172367 is a prime.

It is a super-2 number, since 2×90281231² = 16301401341750722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90281231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90281201) 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, 45140615 + 45140616.

It is an arithmetic number, because the mean of its divisors is an integer number (45140616).

Almost surely, 2^90281231 is an apocalyptic number.

90281231 is a deficient number, since it is larger than the sum of its proper divisors (1).

90281231 is an equidigital number, since it uses as much as digits as its factorization.

90281231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 90281231 is about 9501.6435946630. The cubic root of 90281231 is about 448.6067707588.

The spelling of 90281231 in words is "ninety million, two hundred eighty-one thousand, two hundred thirty-one".