90138106 has 4 divisors (see below), whose sum is σ = 135207162. Its totient is φ = 45069052.

The previous prime is 90138101. The next prime is 90138143. The reversal of 90138106 is 60183109.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60183109 = 7 ⋅8597587.

It can be written as a sum of positive squares in only one way, i.e., 58384881 + 31753225 = 7641^2 + 5635^2 .

It is not an unprimeable number, because it can be changed into a prime (90138101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22534525 + ... + 22534528.

Almost surely, 2^90138106 is an apocalyptic number.

90138106 is a deficient number, since it is larger than the sum of its proper divisors (45069056).

90138106 is a wasteful number, since it uses less digits than its factorization.

90138106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45069055.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 90138106 is about 9494.1090155949. The cubic root of 90138106 is about 448.3695830184.

The spelling of 90138106 in words is "ninety million, one hundred thirty-eight thousand, one hundred six".