187681331249 has 2 divisors, whose sum is σ = 187681331250. Its totient is φ = 187681331248.

The previous prime is 187681331213. The next prime is 187681331291. The reversal of 187681331249 is 942133186781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127212062224 + 60469269025 = 356668^2 + 245905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187681331249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187681331249.

It is not a weakly prime, because it can be changed into another prime (187681331209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93840665624 + 93840665625.

It is an arithmetic number, because the mean of its divisors is an integer number (93840665625).

Almost surely, 2^187681331249 is an apocalyptic number.

It is an amenable number.

187681331249 is a deficient number, since it is larger than the sum of its proper divisors (1).

187681331249 is an equidigital number, since it uses as much as digits as its factorization.

187681331249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The spelling of 187681331249 in words is "one hundred eighty-seven billion, six hundred eighty-one million, three hundred thirty-one thousand, two hundred forty-nine".