15191121 has 8 divisors (see below), whose sum is σ = 22096224. Its totient is φ = 9206720.

The previous prime is 15191119. The next prime is 15191129. The reversal of 15191121 is 12119151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15191121 - 2¹ = 15191119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15191129) 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 in 7 ways as a sum of consecutive naturals, for example, 230136 + ... + 230201.

It is an arithmetic number, because the mean of its divisors is an integer number (2762028).

Almost surely, 2^15191121 is an apocalyptic number.

15191121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15191121 is a deficient number, since it is larger than the sum of its proper divisors (6905103).

15191121 is a wasteful number, since it uses less digits than its factorization.

15191121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460351.

The product of its digits is 90, while the sum is 21.

The square root of 15191121 is about 3897.5788638589. The cubic root of 15191121 is about 247.6642232202.

It can be divided in two parts, 15 and 191121, that multiplied together give a triangular number (2866815 = T₂₃₉₄).

The spelling of 15191121 in words is "fifteen million, one hundred ninety-one thousand, one hundred twenty-one".