2187131 has 4 divisors (see below), whose sum is σ = 2190264. Its totient is φ = 2184000.

The previous prime is 2187121. The next prime is 2187149. The reversal of 2187131 is 1317812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2187131 is a prime.

It is a super-2 number, since 2×2187131² = 9567084022322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2187097 and 2187106.

It is not an unprimeable number, because it can be changed into a prime (2187121) 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, 11 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (547566).

2^2187131 is an apocalyptic number.

2187131 is a deficient number, since it is larger than the sum of its proper divisors (3133).

2187131 is a wasteful number, since it uses less digits than its factorization.

2187131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132.

The product of its digits is 336, while the sum is 23.

The square root of 2187131 is about 1478.8951957458. The cubic root of 2187131 is about 129.8050529727.

The spelling of 2187131 in words is "two million, one hundred eighty-seven thousand, one hundred thirty-one".