90129859 has 2 divisors, whose sum is σ = 90129860. Its totient is φ = 90129858.

The previous prime is 90129799. The next prime is 90129887. The reversal of 90129859 is 95892109.

It is a strong prime.

It is an emirp because it is prime and its reverse (95892109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90129859 - 2⁷ = 90129731 is a prime.

It is not a weakly prime, because it can be changed into another prime (90129899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45064929 + 45064930.

It is an arithmetic number, because the mean of its divisors is an integer number (45064930).

Almost surely, 2^90129859 is an apocalyptic number.

90129859 is a deficient number, since it is larger than the sum of its proper divisors (1).

90129859 is an equidigital number, since it uses as much as digits as its factorization.

90129859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 90129859 is about 9493.6746837039. The cubic root of 90129859 is about 448.3559083848.

The spelling of 90129859 in words is "ninety million, one hundred twenty-nine thousand, eight hundred fifty-nine".