187214561 has 8 divisors (see below), whose sum is σ = 196747584. Its totient is φ = 177917040.

The previous prime is 187214539. The next prime is 187214567. The reversal of 187214561 is 165412781.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187214561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (187214567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57245 + ... + 60426.

It is an arithmetic number, because the mean of its divisors is an integer number (24593448).

Almost surely, 2^187214561 is an apocalyptic number.

It is an amenable number.

187214561 is a deficient number, since it is larger than the sum of its proper divisors (9533023).

187214561 is a wasteful number, since it uses less digits than its factorization.

187214561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117751.

The product of its digits is 13440, while the sum is 35.

The square root of 187214561 is about 13682.6372092517. The cubic root of 187214561 is about 572.0665328007.

The spelling of 187214561 in words is "one hundred eighty-seven million, two hundred fourteen thousand, five hundred sixty-one".