11919143 has 4 divisors (see below), whose sum is σ = 12241320. Its totient is φ = 11596968.

The previous prime is 11919139. The next prime is 11919157. The reversal of 11919143 is 34191911.

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

It is a cyclic number.

It is not a de Polignac number, because 11919143 - 2² = 11919139 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 (11919163) 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, 161033 + ... + 161106.

It is an arithmetic number, because the mean of its divisors is an integer number (3060330).

Almost surely, 2^11919143 is an apocalyptic number.

11919143 is a deficient number, since it is larger than the sum of its proper divisors (322177).

11919143 is an equidigital number, since it uses as much as digits as its factorization.

11919143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322176.

The product of its digits is 972, while the sum is 29.

The square root of 11919143 is about 3452.4111864029. The cubic root of 11919143 is about 228.4274772361.

The spelling of 11919143 in words is "eleven million, nine hundred nineteen thousand, one hundred forty-three".