2181534 has 8 divisors (see below), whose sum is σ = 4363080. Its totient is φ = 727176.

The previous prime is 2181503. The next prime is 2181539. The reversal of 2181534 is 4351812.

2181534 = 737² + 738² + ... + 740².

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

2181534 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181539) 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, 181789 + ... + 181800.

It is an arithmetic number, because the mean of its divisors is an integer number (545385).

2^2181534 is an apocalyptic number.

2181534 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.

2181534 is a wasteful number, since it uses less digits than its factorization.

2181534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363594.

The product of its digits is 960, while the sum is 24.

The square root of 2181534 is about 1477.0016926192. The cubic root of 2181534 is about 129.6942320694.

The spelling of 2181534 in words is "two million, one hundred eighty-one thousand, five hundred thirty-four".