90521129 has 4 divisors (see below), whose sum is σ = 92967684. Its totient is φ = 88074576.

The previous prime is 90521117. The next prime is 90521173. The reversal of 90521129 is 92112509.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46895104 + 43626025 = 6848^2 + 6605^2 .

It is a cyclic number.

It is not a de Polignac number, because 90521129 - 2⁴ = 90521113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90521029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223222 + ... + 1223295.

It is an arithmetic number, because the mean of its divisors is an integer number (23241921).

Almost surely, 2^90521129 is an apocalyptic number.

It is an amenable number.

90521129 is a deficient number, since it is larger than the sum of its proper divisors (2446555).

90521129 is a wasteful number, since it uses less digits than its factorization.

90521129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446554.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 90521129 is about 9514.2592459949. The cubic root of 90521129 is about 449.0037697909.

The spelling of 90521129 in words is "ninety million, five hundred twenty-one thousand, one hundred twenty-nine".