123887987987 has 2 divisors, whose sum is σ = 123887987988. Its totient is φ = 123887987986.

The previous prime is 123887987959. The next prime is 123887988031. The reversal of 123887987987 is 789789788321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123887987987 - 2²⁰ = 123886939411 is a prime.

It is not a weakly prime, because it can be changed into another prime (123887987947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61943993993 + 61943993994.

It is an arithmetic number, because the mean of its divisors is an integer number (61943993994).

Almost surely, 2^123887987987 is an apocalyptic number.

123887987987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123887987987 is an equidigital number, since it uses as much as digits as its factorization.

123887987987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 682795008, while the sum is 77.

The spelling of 123887987987 in words is "one hundred twenty-three billion, eight hundred eighty-seven million, nine hundred eighty-seven thousand, nine hundred eighty-seven".