123555587 has 2 divisors, whose sum is σ = 123555588. Its totient is φ = 123555586.

The previous prime is 123555583. The next prime is 123555647. The reversal of 123555587 is 785555321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123555587 - 2² = 123555583 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123555581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61777793 + 61777794.

It is an arithmetic number, because the mean of its divisors is an integer number (61777794).

Almost surely, 2^123555587 is an apocalyptic number.

123555587 is a deficient number, since it is larger than the sum of its proper divisors (1).

123555587 is an equidigital number, since it uses as much as digits as its factorization.

123555587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 210000, while the sum is 41.

The square root of 123555587 is about 11115.5560814563. The cubic root of 123555587 is about 498.0666499506.

The spelling of 123555587 in words is "one hundred twenty-three million, five hundred fifty-five thousand, five hundred eighty-seven".