12551565 has 32 divisors (see below), whose sum is σ = 21805056. Its totient is φ = 6128640.

The previous prime is 12551557. The next prime is 12551569. The reversal of 12551565 is 56515521.

It is not a de Polignac number, because 12551565 - 2³ = 12551557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12551569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37077 + ... + 37413.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

Almost surely, 2^12551565 is an apocalyptic number.

12551565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12551565 is a deficient number, since it is larger than the sum of its proper divisors (9253491).

12551565 is a wasteful number, since it uses less digits than its factorization.

12551565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its digits is 7500, while the sum is 30.

The square root of 12551565 is about 3542.8187929952. The cubic root of 12551565 is about 232.3981285701.

The spelling of 12551565 in words is "twelve million, five hundred fifty-one thousand, five hundred sixty-five".