90664471 has 2 divisors, whose sum is σ = 90664472. Its totient is φ = 90664470.

The previous prime is 90664439. The next prime is 90664487. The reversal of 90664471 is 17446609.

It is a strong prime.

It is an emirp because it is prime and its reverse (17446609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90664471 - 2⁵ = 90664439 is a prime.

It is a super-3 number, since 3×90664471³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90664471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90644471) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45332235 + 45332236.

It is an arithmetic number, because the mean of its divisors is an integer number (45332236).

Almost surely, 2^90664471 is an apocalyptic number.

90664471 is a deficient number, since it is larger than the sum of its proper divisors (1).

90664471 is an equidigital number, since it uses as much as digits as its factorization.

90664471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 90664471 is about 9521.7892751310. The cubic root of 90664471 is about 449.2406469214.

The spelling of 90664471 in words is "ninety million, six hundred sixty-four thousand, four hundred seventy-one".