90471047 has 2 divisors, whose sum is σ = 90471048. Its totient is φ = 90471046.

The previous prime is 90471023. The next prime is 90471049. The reversal of 90471047 is 74017409.

It is a strong prime.

It is an emirp because it is prime and its reverse (74017409) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90471047 is a prime.

Together with 90471049, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90471049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45235523 + 45235524.

It is an arithmetic number, because the mean of its divisors is an integer number (45235524).

Almost surely, 2^90471047 is an apocalyptic number.

90471047 is a deficient number, since it is larger than the sum of its proper divisors (1).

90471047 is an equidigital number, since it uses as much as digits as its factorization.

90471047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 90471047 is about 9511.6269375959. The cubic root of 90471047 is about 448.9209487766.

The spelling of 90471047 in words is "ninety million, four hundred seventy-one thousand, forty-seven".