90640471 has 2 divisors, whose sum is σ = 90640472. Its totient is φ = 90640470.

The previous prime is 90640453. The next prime is 90640477. The reversal of 90640471 is 17404609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90640471 - 2⁵ = 90640439 is a prime.

It is a super-3 number, since 3×90640471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90640477) 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, 45320235 + 45320236.

It is an arithmetic number, because the mean of its divisors is an integer number (45320236).

Almost surely, 2^90640471 is an apocalyptic number.

90640471 is a deficient number, since it is larger than the sum of its proper divisors (1).

90640471 is an equidigital number, since it uses as much as digits as its factorization.

90640471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 90640471 is about 9520.5289243823. The cubic root of 90640471 is about 449.2010035826.

The spelling of 90640471 in words is "ninety million, six hundred forty thousand, four hundred seventy-one".