27915121 has 8 divisors (see below), whose sum is σ = 30149504. Its totient is φ = 25693200.

The previous prime is 27915119. The next prime is 27915143. The reversal of 27915121 is 12151972.

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

It is not a de Polignac number, because 27915121 - 2¹ = 27915119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27915121.

It is not an unprimeable number, because it can be changed into a prime (27915191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1846 + ... + 7696.

It is an arithmetic number, because the mean of its divisors is an integer number (3768688).

Almost surely, 2^27915121 is an apocalyptic number.

It is an amenable number.

27915121 is a deficient number, since it is larger than the sum of its proper divisors (2234383).

27915121 is a wasteful number, since it uses less digits than its factorization.

27915121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6231.

The product of its digits is 1260, while the sum is 28.

The square root of 27915121 is about 5283.4762230940. The cubic root of 27915121 is about 303.3517501464.

It can be divided in two parts, 279 and 15121, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 27915121 in words is "twenty-seven million, nine hundred fifteen thousand, one hundred twenty-one".