12815551 has 8 divisors (see below), whose sum is σ = 14886944. Its totient is φ = 10804320.

The previous prime is 12815533. The next prime is 12815581. The reversal of 12815551 is 15551821.

12815551 = T₂₇₉ + T₂₈₀ + ... + T₄₆₁.

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

It is not a de Polignac number, because 12815551 - 2⁷ = 12815423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12815581) 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, 14580 + ... + 15433.

It is an arithmetic number, because the mean of its divisors is an integer number (1860868).

Almost surely, 2^12815551 is an apocalyptic number.

12815551 is a deficient number, since it is larger than the sum of its proper divisors (2071393).

12815551 is an equidigital number, since it uses as much as digits as its factorization.

12815551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30081.

The product of its digits is 2000, while the sum is 28.

The square root of 12815551 is about 3579.8814226172. The cubic root of 12815551 is about 234.0161128019.

It can be divided in two parts, 12815 and 551, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 12815551 in words is "twelve million, eight hundred fifteen thousand, five hundred fifty-one".