12958509 has 4 divisors (see below), whose sum is σ = 17278016. Its totient is φ = 8639004.

The previous prime is 12958507. The next prime is 12958529. The reversal of 12958509 is 90585921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90585921 = 3 ⋅30195307.

It is not a de Polignac number, because 12958509 - 2¹ = 12958507 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12958507) 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, 2159749 + ... + 2159754.

It is an arithmetic number, because the mean of its divisors is an integer number (4319504).

Almost surely, 2^12958509 is an apocalyptic number.

It is an amenable number.

12958509 is a deficient number, since it is larger than the sum of its proper divisors (4319507).

12958509 is an equidigital number, since it uses as much as digits as its factorization.

12958509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319506.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 12958509 is about 3599.7929107103. The cubic root of 12958509 is about 234.8830503042.

The spelling of 12958509 in words is "twelve million, nine hundred fifty-eight thousand, five hundred nine".