90128056349 has 2 divisors, whose sum is σ = 90128056350. Its totient is φ = 90128056348.

The previous prime is 90128056339. The next prime is 90128056379. The reversal of 90128056349 is 94365082109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89886036100 + 242020249 = 299810^2 + 15557^2 .

It is an emirp because it is prime and its reverse (94365082109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90128056349 - 2²⁴ = 90111279133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90128056339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45064028174 + 45064028175.

It is an arithmetic number, because the mean of its divisors is an integer number (45064028175).

Almost surely, 2^90128056349 is an apocalyptic number.

It is an amenable number.

90128056349 is a deficient number, since it is larger than the sum of its proper divisors (1).

90128056349 is an equidigital number, since it uses as much as digits as its factorization.

90128056349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 90128056349 in words is "ninety billion, one hundred twenty-eight million, fifty-six thousand, three hundred forty-nine".