90435181 has 2 divisors, whose sum is σ = 90435182. Its totient is φ = 90435180.

The previous prime is 90435179. The next prime is 90435227. The reversal of 90435181 is 18153409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56025225 + 34409956 = 7485^2 + 5866^2 .

It is a cyclic number.

It is not a de Polignac number, because 90435181 - 2¹ = 90435179 is a prime.

It is a super-2 number, since 2×90435181² = 16357043925005522, which contains 22 as substring.

Together with 90435179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90435131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45217590 + 45217591.

It is an arithmetic number, because the mean of its divisors is an integer number (45217591).

Almost surely, 2^90435181 is an apocalyptic number.

It is an amenable number.

90435181 is a deficient number, since it is larger than the sum of its proper divisors (1).

90435181 is an equidigital number, since it uses as much as digits as its factorization.

90435181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 90435181 is about 9509.7413739807. The cubic root of 90435181 is about 448.8616180942.

The spelling of 90435181 in words is "ninety million, four hundred thirty-five thousand, one hundred eighty-one".