11531898 has 48 divisors (see below), whose sum is σ = 30064320. Its totient is φ = 3120768.

The previous prime is 11531893. The next prime is 11531903. The reversal of 11531898 is 89813511.

It is an interprime number because it is at equal distance from previous prime (11531893) and next prime (11531903).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11531893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15 + ... + 4802.

It is an arithmetic number, because the mean of its divisors is an integer number (626340).

Almost surely, 2^11531898 is an apocalyptic number.

11531898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11531898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15032160).

11531898 is an abundant number, since it is smaller than the sum of its proper divisors (18532422).

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

11531898 is a wasteful number, since it uses less digits than its factorization.

11531898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4851 (or 4848 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 11531898 is about 3395.8648382997. The cubic root of 11531898 is about 225.9263732806.

The spelling of 11531898 in words is "eleven million, five hundred thirty-one thousand, eight hundred ninety-eight".