123181087 has 2 divisors, whose sum is σ = 123181088. Its totient is φ = 123181086.

The previous prime is 123181081. The next prime is 123181109. The reversal of 123181087 is 780181321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123181087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123181081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61590543 + 61590544.

It is an arithmetic number, because the mean of its divisors is an integer number (61590544).

Almost surely, 2^123181087 is an apocalyptic number.

123181087 is a deficient number, since it is larger than the sum of its proper divisors (1).

123181087 is an equidigital number, since it uses as much as digits as its factorization.

123181087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 123181087 is about 11098.6975361977. The cubic root of 123181087 is about 497.5629232803.

The spelling of 123181087 in words is "one hundred twenty-three million, one hundred eighty-one thousand, eighty-seven".