90438161 has 4 divisors (see below), whose sum is σ = 98659824. Its totient is φ = 82216500.

The previous prime is 90438133. The next prime is 90438343. The reversal of 90438161 is 16183409.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16183409 = 11 ⋅1471219.

It is a cyclic number.

It is not a de Polignac number, because 90438161 - 2²⁶ = 23329297 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 (90438961) 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, 4110815 + ... + 4110836.

It is an arithmetic number, because the mean of its divisors is an integer number (24664956).

Almost surely, 2^90438161 is an apocalyptic number.

It is an amenable number.

90438161 is a deficient number, since it is larger than the sum of its proper divisors (8221663).

90438161 is a wasteful number, since it uses less digits than its factorization.

90438161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8221662.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 90438161 is about 9509.8980541329. The cubic root of 90438161 is about 448.8665483028.

The spelling of 90438161 in words is "ninety million, four hundred thirty-eight thousand, one hundred sixty-one".