12491005 has 8 divisors (see below), whose sum is σ = 15871032. Its totient is φ = 9404928.

The previous prime is 12490997. The next prime is 12491009. The reversal of 12491005 is 50019421.

It can be written as a sum of positive squares in 4 ways, for example, as 248004 + 12243001 = 498^2 + 3499^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12491005 - 2³ = 12490997 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 (12491009) 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, 73392 + ... + 73561.

It is an arithmetic number, because the mean of its divisors is an integer number (1983879).

Almost surely, 2^12491005 is an apocalyptic number.

It is an amenable number.

12491005 is a deficient number, since it is larger than the sum of its proper divisors (3380027).

12491005 is a wasteful number, since it uses less digits than its factorization.

12491005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146975.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 12491005 is about 3534.2615919029. The cubic root of 12491005 is about 232.0237602003.

The spelling of 12491005 in words is "twelve million, four hundred ninety-one thousand, five".