187113921 has 8 divisors (see below), whose sum is σ = 256228224. Its totient is φ = 121371120.

The previous prime is 187113833. The next prime is 187113937. The reversal of 187113921 is 129311781.

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

It is not a de Polignac number, because 187113921 - 2⁷ = 187113793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (187113991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842745 + ... + 842966.

It is an arithmetic number, because the mean of its divisors is an integer number (32028528).

Almost surely, 2^187113921 is an apocalyptic number.

It is an amenable number.

187113921 is a deficient number, since it is larger than the sum of its proper divisors (69114303).

187113921 is a wasteful number, since it uses less digits than its factorization.

187113921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685751.

The product of its digits is 3024, while the sum is 33.

The square root of 187113921 is about 13678.9590612736. The cubic root of 187113921 is about 571.9640067739.

The spelling of 187113921 in words is "one hundred eighty-seven million, one hundred thirteen thousand, nine hundred twenty-one".