187912121 has 8 divisors (see below), whose sum is σ = 189886464. Its totient is φ = 185945760.

The previous prime is 187912099. The next prime is 187912171. The reversal of 187912121 is 121219781.

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

It is a cyclic number.

It is not a de Polignac number, because 187912121 - 2⁶ = 187912057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (187912171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53021 + ... + 56453.

It is an arithmetic number, because the mean of its divisors is an integer number (23735808).

Almost surely, 2^187912121 is an apocalyptic number.

It is an amenable number.

187912121 is a deficient number, since it is larger than the sum of its proper divisors (1974343).

187912121 is a wasteful number, since it uses less digits than its factorization.

187912121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991.

The product of its digits is 2016, while the sum is 32.

The square root of 187912121 is about 13708.1042088248. The cubic root of 187912121 is about 572.7761573298.

The spelling of 187912121 in words is "one hundred eighty-seven million, nine hundred twelve thousand, one hundred twenty-one".