12551591 has 4 divisors (see below), whose sum is σ = 13517112. Its totient is φ = 11586072.

The previous prime is 12551587. The next prime is 12551597. The reversal of 12551591 is 19515521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19515521 = 29 ⋅672949.

It is a cyclic number.

It is not a de Polignac number, because 12551591 - 2² = 12551587 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 (12551597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482741 + ... + 482766.

It is an arithmetic number, because the mean of its divisors is an integer number (3379278).

Almost surely, 2^12551591 is an apocalyptic number.

12551591 is a deficient number, since it is larger than the sum of its proper divisors (965521).

12551591 is an equidigital number, since it uses as much as digits as its factorization.

12551591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965520.

The product of its digits is 2250, while the sum is 29.

The square root of 12551591 is about 3542.8224623879. The cubic root of 12551591 is about 232.3982890374.

The spelling of 12551591 in words is "twelve million, five hundred fifty-one thousand, five hundred ninety-one".