12813551 has 4 divisors (see below), whose sum is σ = 12826272. Its totient is φ = 12800832.

The previous prime is 12813523. The next prime is 12813557. The reversal of 12813551 is 15531821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15531821 = 2999 ⋅5179.

It is a cyclic number.

It is not a de Polignac number, because 12813551 - 2⁶ = 12813487 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 12813551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12813557) 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 3 ways as a sum of consecutive naturals, for example, 4706 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (3206568).

Almost surely, 2^12813551 is an apocalyptic number.

12813551 is a deficient number, since it is larger than the sum of its proper divisors (12721).

12813551 is a wasteful number, since it uses less digits than its factorization.

12813551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12720.

The product of its digits is 1200, while the sum is 26.

The square root of 12813551 is about 3579.6020728567. The cubic root of 12813551 is about 234.0039386193.

The spelling of 12813551 in words is "twelve million, eight hundred thirteen thousand, five hundred fifty-one".