2187251 has 4 divisors (see below), whose sum is σ = 2386104. Its totient is φ = 1988400.

The previous prime is 2187247. The next prime is 2187259. The reversal of 2187251 is 1527812.

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

It is a cyclic number.

It is not a de Polignac number, because 2187251 - 2² = 2187247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2187251.

It is not an unprimeable number, because it can be changed into a prime (2187259) 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, 99410 + ... + 99431.

It is an arithmetic number, because the mean of its divisors is an integer number (596526).

2^2187251 is an apocalyptic number.

2187251 is a deficient number, since it is larger than the sum of its proper divisors (198853).

2187251 is a wasteful number, since it uses less digits than its factorization.

2187251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198852.

The product of its digits is 1120, while the sum is 26.

The square root of 2187251 is about 1478.9357660155. The cubic root of 2187251 is about 129.8074269078.

The spelling of 2187251 in words is "two million, one hundred eighty-seven thousand, two hundred fifty-one".