90209477 has 2 divisors, whose sum is σ = 90209478. Its totient is φ = 90209476.

The previous prime is 90209447. The next prime is 90209479. The reversal of 90209477 is 77490209.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90136036 + 73441 = 9494^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 90209477 - 2⁸ = 90209221 is a prime.

It is a super-2 number, since 2×90209477² = 16275499481227058, which contains 22 as substring.

Together with 90209479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90209477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90209479) 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, 45104738 + 45104739.

It is an arithmetic number, because the mean of its divisors is an integer number (45104739).

Almost surely, 2^90209477 is an apocalyptic number.

It is an amenable number.

90209477 is a deficient number, since it is larger than the sum of its proper divisors (1).

90209477 is an equidigital number, since it uses as much as digits as its factorization.

90209477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 90209477 is about 9497.8669710625. The cubic root of 90209477 is about 448.4878908931.

The spelling of 90209477 in words is "ninety million, two hundred nine thousand, four hundred seventy-seven".