155011138 has 4 divisors (see below), whose sum is σ = 232516710. Its totient is φ = 77505568.

The previous prime is 155011127. The next prime is 155011163. The reversal of 155011138 is 831110551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831110551 = 181 ⋅4591771.

It can be written as a sum of positive squares in only one way, i.e., 154579489 + 431649 = 12433^2 + 657^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38752783 + ... + 38752786.

Almost surely, 2^155011138 is an apocalyptic number.

155011138 is a deficient number, since it is larger than the sum of its proper divisors (77505572).

155011138 is an equidigital number, since it uses as much as digits as its factorization.

155011138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77505571.

The product of its (nonzero) digits is 600, while the sum is 25.

The square root of 155011138 is about 12450.3469027975. The cubic root of 155011138 is about 537.1814018167.

Adding to 155011138 its reverse (831110551), we get a palindrome (986121689).

The spelling of 155011138 in words is "one hundred fifty-five million, eleven thousand, one hundred thirty-eight".