12561937 has 4 divisors (see below), whose sum is σ = 12586480. Its totient is φ = 12537396.

The previous prime is 12561931. The next prime is 12561947. The reversal of 12561937 is 73916521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12561937 - 2²³ = 4173329 is a prime.

It is a super-2 number, since 2×12561937² = 315604522383938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12561931) 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, 11487 + ... + 12532.

It is an arithmetic number, because the mean of its divisors is an integer number (3146620).

Almost surely, 2^12561937 is an apocalyptic number.

It is an amenable number.

12561937 is a deficient number, since it is larger than the sum of its proper divisors (24543).

12561937 is an equidigital number, since it uses as much as digits as its factorization.

12561937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24542.

The product of its digits is 11340, while the sum is 34.

The square root of 12561937 is about 3544.2822968832. The cubic root of 12561937 is about 232.4621250980.

The spelling of 12561937 in words is "twelve million, five hundred sixty-one thousand, nine hundred thirty-seven".