181436006887 has 2 divisors, whose sum is σ = 181436006888. Its totient is φ = 181436006886.

The previous prime is 181436006839. The next prime is 181436006929. The reversal of 181436006887 is 788600634181.

It is a strong prime.

It is an emirp because it is prime and its reverse (788600634181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181436006887 - 2²³ = 181427618279 is a prime.

It is a super-2 number, since 2×181436006887² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181436000887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90718003443 + 90718003444.

It is an arithmetic number, because the mean of its divisors is an integer number (90718003444).

Almost surely, 2^181436006887 is an apocalyptic number.

181436006887 is a deficient number, since it is larger than the sum of its proper divisors (1).

181436006887 is an equidigital number, since it uses as much as digits as its factorization.

181436006887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 181436006887 in words is "one hundred eighty-one billion, four hundred thirty-six million, six thousand, eight hundred eighty-seven".