15191138 has 4 divisors (see below), whose sum is σ = 22786710. Its totient is φ = 7595568.

The previous prime is 15191131. The next prime is 15191159. The reversal of 15191138 is 83119151.

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., 15108769 + 82369 = 3887^2 + 287^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15191138.

It is not an unprimeable number, because it can be changed into a prime (15191131) by changing a digit.

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, 3797783 + ... + 3797786.

Almost surely, 2^15191138 is an apocalyptic number.

15191138 is a deficient number, since it is larger than the sum of its proper divisors (7595572).

15191138 is an equidigital number, since it uses as much as digits as its factorization.

15191138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7595571.

The product of its digits is 1080, while the sum is 29.

The square root of 15191138 is about 3897.5810446994. The cubic root of 15191138 is about 247.6643156051.

The spelling of 15191138 in words is "fifteen million, one hundred ninety-one thousand, one hundred thirty-eight".