12351561 has 8 divisors (see below), whose sum is σ = 16491360. Its totient is φ = 8223072.

The previous prime is 12351551. The next prime is 12351583. The reversal of 12351561 is 16515321.

12351561 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12351561 - 2⁶ = 12351497 is a prime.

It is a super-2 number, since 2×12351561² = 305122118273442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12351511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 4973.

It is an arithmetic number, because the mean of its divisors is an integer number (2061420).

Almost surely, 2^12351561 is an apocalyptic number.

It is an amenable number.

12351561 is a deficient number, since it is larger than the sum of its proper divisors (4139799).

12351561 is an equidigital number, since it uses as much as digits as its factorization.

12351561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655.

The product of its digits is 900, while the sum is 24.

The square root of 12351561 is about 3514.4787664745. The cubic root of 12351561 is about 231.1571240379.

Adding to 12351561 its reverse (16515321), we get a palindrome (28866882).

The spelling of 12351561 in words is "twelve million, three hundred fifty-one thousand, five hundred sixty-one".