11551998 has 8 divisors (see below), whose sum is σ = 23104008. Its totient is φ = 3850664.

The previous prime is 11551979. The next prime is 11551999. The reversal of 11551998 is 89915511.

11551998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

11551998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551999) 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, 962661 + ... + 962672.

It is an arithmetic number, because the mean of its divisors is an integer number (2888001).

Almost surely, 2^11551998 is an apocalyptic number.

11551998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11551998 is a wasteful number, since it uses less digits than its factorization.

11551998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925338.

The product of its digits is 16200, while the sum is 39.

The square root of 11551998 is about 3398.8230315802. The cubic root of 11551998 is about 226.0575596726.

The spelling of 11551998 in words is "eleven million, five hundred fifty-one thousand, nine hundred ninety-eight".