90129769 has 2 divisors, whose sum is σ = 90129770. Its totient is φ = 90129768.

The previous prime is 90129761. The next prime is 90129791. The reversal of 90129769 is 96792109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80766169 + 9363600 = 8987^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 90129769 - 2³ = 90129761 is a prime.

It is a super-2 number, since 2×90129769² = 16246750519986722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90129761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45064884 + 45064885.

It is an arithmetic number, because the mean of its divisors is an integer number (45064885).

Almost surely, 2^90129769 is an apocalyptic number.

It is an amenable number.

90129769 is a deficient number, since it is larger than the sum of its proper divisors (1).

90129769 is an equidigital number, since it uses as much as digits as its factorization.

90129769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 90129769 is about 9493.6699437046. The cubic root of 90129769 is about 448.3557591481.

It can be divided in two parts, 9012 and 9769, that added together give a palindrome (18781).

The spelling of 90129769 in words is "ninety million, one hundred twenty-nine thousand, seven hundred sixty-nine".