187040740781 has 2 divisors, whose sum is σ = 187040740782. Its totient is φ = 187040740780.

The previous prime is 187040740771. The next prime is 187040740811. The reversal of 187040740781 is 187047040781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177380799556 + 9659941225 = 421166^2 + 98285^2 .

It is a cyclic number.

It is not a de Polignac number, because 187040740781 - 2⁶ = 187040740717 is a prime.

It is a super-2 number, since 2×187040740781² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187040740771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93520370390 + 93520370391.

It is an arithmetic number, because the mean of its divisors is an integer number (93520370391).

Almost surely, 2^187040740781 is an apocalyptic number.

It is an amenable number.

187040740781 is a deficient number, since it is larger than the sum of its proper divisors (1).

187040740781 is an equidigital number, since it uses as much as digits as its factorization.

187040740781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 351232, while the sum is 47.

The spelling of 187040740781 in words is "one hundred eighty-seven billion, forty million, seven hundred forty thousand, seven hundred eighty-one".