11958109 has 4 divisors (see below), whose sum is σ = 12018400. Its totient is φ = 11897820.

The previous prime is 11958103. The next prime is 11958113. The reversal of 11958109 is 90185911.

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: 90185911 = 29 ⋅3109859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11958109 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 (11958103) 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, 29847 + ... + 30244.

It is an arithmetic number, because the mean of its divisors is an integer number (3004600).

Almost surely, 2^11958109 is an apocalyptic number.

It is an amenable number.

11958109 is a deficient number, since it is larger than the sum of its proper divisors (60291).

11958109 is an equidigital number, since it uses as much as digits as its factorization.

11958109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60290.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 11958109 is about 3458.0498839664. The cubic root of 11958109 is about 228.6761311049.

The spelling of 11958109 in words is "eleven million, nine hundred fifty-eight thousand, one hundred nine".