90039161 has 4 divisors (see below), whose sum is σ = 90112500. Its totient is φ = 89965824.

The previous prime is 90039151. The next prime is 90039163. The reversal of 90039161 is 16193009.

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 53509225 + 36529936 = 7315^2 + 6044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90039161 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 (90039163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34796 + ... + 37293.

It is an arithmetic number, because the mean of its divisors is an integer number (22528125).

Almost surely, 2^90039161 is an apocalyptic number.

It is an amenable number.

90039161 is a deficient number, since it is larger than the sum of its proper divisors (73339).

90039161 is a wasteful number, since it uses less digits than its factorization.

90039161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73338.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 90039161 is about 9488.8967219588. The cubic root of 90039161 is about 448.2054638569.

The spelling of 90039161 in words is "ninety million, thirty-nine thousand, one hundred sixty-one".