90129229 has 2 divisors, whose sum is σ = 90129230. Its totient is φ = 90129228.

The previous prime is 90129211. The next prime is 90129239. The reversal of 90129229 is 92292109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68923204 + 21206025 = 8302^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 90129229 - 2⁵ = 90129197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90129194 and 90129203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90129209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45064614 + 45064615.

It is an arithmetic number, because the mean of its divisors is an integer number (45064615).

Almost surely, 2^90129229 is an apocalyptic number.

It is an amenable number.

90129229 is a deficient number, since it is larger than the sum of its proper divisors (1).

90129229 is an equidigital number, since it uses as much as digits as its factorization.

90129229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 90129229 is about 9493.6415036592. The cubic root of 90129229 is about 448.3548637259.

The spelling of 90129229 in words is "ninety million, one hundred twenty-nine thousand, two hundred twenty-nine".