12561037 has 4 divisors (see below), whose sum is σ = 12733180. Its totient is φ = 12388896.

The previous prime is 12561023. The next prime is 12561061. The reversal of 12561037 is 73016521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73016521 = 47 ⋅1553543.

It can be written as a sum of positive squares in 2 ways, for example, as 9554281 + 3006756 = 3091^2 + 1734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12561037 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 (12561007) 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, 85962 + ... + 86107.

It is an arithmetic number, because the mean of its divisors is an integer number (3183295).

Almost surely, 2^12561037 is an apocalyptic number.

It is an amenable number.

12561037 is a deficient number, since it is larger than the sum of its proper divisors (172143).

12561037 is an equidigital number, since it uses as much as digits as its factorization.

12561037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172142.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 12561037 is about 3544.1553295532. The cubic root of 12561037 is about 232.4565733823.

Adding to 12561037 its reverse (73016521), we get a palindrome (85577558).

It can be divided in two parts, 1256103 and 7, that multiplied together give a triangular number (8792721 = T₄₁₉₃).

The spelling of 12561037 in words is "twelve million, five hundred sixty-one thousand, thirty-seven".