90471439 has 2 divisors, whose sum is σ = 90471440. Its totient is φ = 90471438.

The previous prime is 90471431. The next prime is 90471449. The reversal of 90471439 is 93417409.

It is a weak prime.

It is an emirp because it is prime and its reverse (93417409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90471439 - 2³ = 90471431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90471398 and 90471407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90471431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45235719 + 45235720.

It is an arithmetic number, because the mean of its divisors is an integer number (45235720).

Almost surely, 2^90471439 is an apocalyptic number.

90471439 is a deficient number, since it is larger than the sum of its proper divisors (1).

90471439 is an equidigital number, since it uses as much as digits as its factorization.

90471439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 90471439 is about 9511.6475439326. The cubic root of 90471439 is about 448.9215971489.

The spelling of 90471439 in words is "ninety million, four hundred seventy-one thousand, four hundred thirty-nine".