187887121 has 2 divisors, whose sum is σ = 187887122. Its totient is φ = 187887120.

The previous prime is 187887113. The next prime is 187887149. The reversal of 187887121 is 121788781.

187887121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176597521 + 11289600 = 13289^2 + 3360^2 .

It is a cyclic number.

It is not a de Polignac number, because 187887121 - 2³ = 187887113 is a prime.

It is not a weakly prime, because it can be changed into another prime (187887101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93943560 + 93943561.

It is an arithmetic number, because the mean of its divisors is an integer number (93943561).

Almost surely, 2^187887121 is an apocalyptic number.

It is an amenable number.

187887121 is a deficient number, since it is larger than the sum of its proper divisors (1).

187887121 is an equidigital number, since it uses as much as digits as its factorization.

187887121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50176, while the sum is 43.

The square root of 187887121 is about 13707.1923091492. The cubic root of 187887121 is about 572.7507553158.

The spelling of 187887121 in words is "one hundred eighty-seven million, eight hundred eighty-seven thousand, one hundred twenty-one".