90144479 has 2 divisors, whose sum is σ = 90144480. Its totient is φ = 90144478.

The previous prime is 90144463. The next prime is 90144491. The reversal of 90144479 is 97444109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90144479 - 2⁴ = 90144463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90144179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45072239 + 45072240.

It is an arithmetic number, because the mean of its divisors is an integer number (45072240).

Almost surely, 2^90144479 is an apocalyptic number.

90144479 is a deficient number, since it is larger than the sum of its proper divisors (1).

90144479 is an equidigital number, since it uses as much as digits as its factorization.

90144479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 90144479 is about 9494.4446388401. Note that the first 3 decimals coincide. The cubic root of 90144479 is about 448.3801497371.

The spelling of 90144479 in words is "ninety million, one hundred forty-four thousand, four hundred seventy-nine".