187142881 has 8 divisors (see below), whose sum is σ = 197475840. Its totient is φ = 176992992.

The previous prime is 187142869. The next prime is 187142903. The reversal of 187142881 is 188241781.

187142881 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187142881 is a prime.

It is a super-2 number, since 2×187142881² = 70044915817960322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187142821) 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, 43665 + ... + 47758.

It is an arithmetic number, because the mean of its divisors is an integer number (24684480).

Almost surely, 2^187142881 is an apocalyptic number.

It is an amenable number.

187142881 is a deficient number, since it is larger than the sum of its proper divisors (10332959).

187142881 is an equidigital number, since it uses as much as digits as its factorization.

187142881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91535.

The product of its digits is 28672, while the sum is 40.

The square root of 187142881 is about 13680.0175803981. The cubic root of 187142881 is about 571.9935132604.

The spelling of 187142881 in words is "one hundred eighty-seven million, one hundred forty-two thousand, eight hundred eighty-one".