145138138 has 4 divisors (see below), whose sum is σ = 217707210. Its totient is φ = 72569068.

The previous prime is 145138121. The next prime is 145138141. The reversal of 145138138 is 831831541.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 140588449 + 4549689 = 11857^2 + 2133^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36284533 + ... + 36284536.

Almost surely, 2^145138138 is an apocalyptic number.

145138138 is a deficient number, since it is larger than the sum of its proper divisors (72569072).

145138138 is an equidigital number, since it uses as much as digits as its factorization.

145138138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72569071.

The product of its digits is 11520, while the sum is 34.

The square root of 145138138 is about 12047.3290815848. The cubic root of 145138138 is about 525.5255665102.

Adding to 145138138 its reverse (831831541), we get a palindrome (976969679).

The spelling of 145138138 in words is "one hundred forty-five million, one hundred thirty-eight thousand, one hundred thirty-eight".