11531918 has 4 divisors (see below), whose sum is σ = 17297880. Its totient is φ = 5765958.

The previous prime is 11531909. The next prime is 11531921. The reversal of 11531918 is 81913511.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2882978 + ... + 2882981.

It is an arithmetic number, because the mean of its divisors is an integer number (4324470).

Almost surely, 2^11531918 is an apocalyptic number.

11531918 is a deficient number, since it is larger than the sum of its proper divisors (5765962).

11531918 is an equidigital number, since it uses as much as digits as its factorization.

11531918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765961.

The product of its digits is 1080, while the sum is 29.

The square root of 11531918 is about 3395.8677830563. The cubic root of 11531918 is about 225.9265038900.

The spelling of 11531918 in words is "eleven million, five hundred thirty-one thousand, nine hundred eighteen".