123019999987 has 2 divisors, whose sum is σ = 123019999988. Its totient is φ = 123019999986.

The previous prime is 123019999981. The next prime is 123020000041. The reversal of 123019999987 is 789999910321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123019999987 - 2¹⁵ = 123019967219 is a prime.

It is a super-3 number, since 3×123019999987³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (123019999981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61509999993 + 61509999994.

It is an arithmetic number, because the mean of its divisors is an integer number (61509999994).

Almost surely, 2^123019999987 is an apocalyptic number.

123019999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123019999987 is an equidigital number, since it uses as much as digits as its factorization.

123019999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19840464, while the sum is 67.

The spelling of 123019999987 in words is "one hundred twenty-three billion, nineteen million, nine hundred ninety-nine thousand, nine hundred eighty-seven".