187812155081 has 2 divisors, whose sum is σ = 187812155082. Its totient is φ = 187812155080.

The previous prime is 187812155017. The next prime is 187812155101. The reversal of 187812155081 is 180551218781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100435751056 + 87376404025 = 316916^2 + 295595^2 .

It is an emirp because it is prime and its reverse (180551218781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187812155081 - 2⁶ = 187812155017 is a prime.

It is a super-2 number, since 2×187812155081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (187812455081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93906077540 + 93906077541.

It is an arithmetic number, because the mean of its divisors is an integer number (93906077541).

Almost surely, 2^187812155081 is an apocalyptic number.

It is an amenable number.

187812155081 is a deficient number, since it is larger than the sum of its proper divisors (1).

187812155081 is an equidigital number, since it uses as much as digits as its factorization.

187812155081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 179200, while the sum is 47.

The spelling of 187812155081 in words is "one hundred eighty-seven billion, eight hundred twelve million, one hundred fifty-five thousand, eighty-one".