11958491 has 4 divisors (see below), whose sum is σ = 12019392. Its totient is φ = 11897592.

The previous prime is 11958487. The next prime is 11958493. The reversal of 11958491 is 19485911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19485911 = 631 ⋅30881.

It is a cyclic number.

It is not a de Polignac number, because 11958491 - 2² = 11958487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11958493) 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, 30155 + ... + 30548.

It is an arithmetic number, because the mean of its divisors is an integer number (3004848).

Almost surely, 2^11958491 is an apocalyptic number.

11958491 is a deficient number, since it is larger than the sum of its proper divisors (60901).

11958491 is an equidigital number, since it uses as much as digits as its factorization.

11958491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60900.

The product of its digits is 12960, while the sum is 38.

The square root of 11958491 is about 3458.1051169680. The cubic root of 11958491 is about 228.6785660872.

The spelling of 11958491 in words is "eleven million, nine hundred fifty-eight thousand, four hundred ninety-one".