187121157 has 8 divisors (see below), whose sum is σ = 249892800. Its totient is φ = 124548480.

The previous prime is 187121149. The next prime is 187121191. The reversal of 187121157 is 751121781.

187121157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 187121157 - 2³ = 187121149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187121197) 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, 47532 + ... + 51317.

It is an arithmetic number, because the mean of its divisors is an integer number (31236600).

Almost surely, 2^187121157 is an apocalyptic number.

It is an amenable number.

187121157 is a deficient number, since it is larger than the sum of its proper divisors (62771643).

187121157 is an equidigital number, since it uses as much as digits as its factorization.

187121157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99483.

The product of its digits is 3920, while the sum is 33.

The square root of 187121157 is about 13679.2235525267. The cubic root of 187121157 is about 571.9713796054.

The spelling of 187121157 in words is "one hundred eighty-seven million, one hundred twenty-one thousand, one hundred fifty-seven".