109999999987 has 2 divisors, whose sum is σ = 109999999988. Its totient is φ = 109999999986.

The previous prime is 109999999979. The next prime is 110000000003. The reversal of 109999999987 is 789999999901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109999999987 - 2³ = 109999999979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 109999999898 and 109999999907.

It is not a weakly prime, because it can be changed into another prime (109999999937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54999999993 + 54999999994.

It is an arithmetic number, because the mean of its divisors is an integer number (54999999994).

Almost surely, 2^109999999987 is an apocalyptic number.

109999999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

109999999987 is an equidigital number, since it uses as much as digits as its factorization.

109999999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2410616376, while the sum is 88.

The spelling of 109999999987 in words is "one hundred nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".