12358991 has 4 divisors (see below), whose sum is σ = 12374832. Its totient is φ = 12343152.

The previous prime is 12358967. The next prime is 12358993. The reversal of 12358991 is 19985321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12358991 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 (12358993) 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, 6686 + ... + 8331.

It is an arithmetic number, because the mean of its divisors is an integer number (3093708).

Almost surely, 2^12358991 is an apocalyptic number.

12358991 is a deficient number, since it is larger than the sum of its proper divisors (15841).

12358991 is an equidigital number, since it uses as much as digits as its factorization.

12358991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840.

The product of its digits is 19440, while the sum is 38.

The square root of 12358991 is about 3515.5356633094. The cubic root of 12358991 is about 231.2034650946.

The spelling of 12358991 in words is "twelve million, three hundred fifty-eight thousand, nine hundred ninety-one".