12517091 has 4 divisors (see below), whose sum is σ = 12688632. Its totient is φ = 12345552.

The previous prime is 12517081. The next prime is 12517093. The reversal of 12517091 is 19071521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19071521 = 7 ⋅2724503.

It is a cyclic number.

It is not a de Polignac number, because 12517091 - 2¹⁸ = 12254947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12517091.

It is not an unprimeable number, because it can be changed into a prime (12517093) 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, 85661 + ... + 85806.

It is an arithmetic number, because the mean of its divisors is an integer number (3172158).

Almost surely, 2^12517091 is an apocalyptic number.

12517091 is a deficient number, since it is larger than the sum of its proper divisors (171541).

12517091 is an equidigital number, since it uses as much as digits as its factorization.

12517091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171540.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 12517091 is about 3537.9501127065. The cubic root of 12517091 is about 232.1851660367.

The spelling of 12517091 in words is "twelve million, five hundred seventeen thousand, ninety-one".