187121131 has 2 divisors, whose sum is σ = 187121132. Its totient is φ = 187121130.

The previous prime is 187121113. The next prime is 187121149. The reversal of 187121131 is 131121781.

Together with previous prime (187121113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (187121113) and next prime (187121149).

It is a cyclic number.

It is not a de Polignac number, because 187121131 - 2⁷ = 187121003 is a prime.

It is a super-2 number, since 2×187121131² = 70028635333438322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 187121096 and 187121105.

It is not a weakly prime, because it can be changed into another prime (187121191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93560565 + 93560566.

It is an arithmetic number, because the mean of its divisors is an integer number (93560566).

Almost surely, 2^187121131 is an apocalyptic number.

187121131 is the 8652-nd centered pentagonal number.

187121131 is a deficient number, since it is larger than the sum of its proper divisors (1).

187121131 is an equidigital number, since it uses as much as digits as its factorization.

187121131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 25.

The square root of 187121131 is about 13679.2226021803. Note that the first 3 decimals coincide. The cubic root of 187121131 is about 571.9713531140.

The spelling of 187121131 in words is "one hundred eighty-seven million, one hundred twenty-one thousand, one hundred thirty-one".