108779987 has 2 divisors, whose sum is σ = 108779988. Its totient is φ = 108779986.

The previous prime is 108779977. The next prime is 108780013. The reversal of 108779987 is 789977801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 108779987 - 2¹⁶ = 108714451 is a prime.

It is not a weakly prime, because it can be changed into another prime (108779977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54389993 + 54389994.

It is an arithmetic number, because the mean of its divisors is an integer number (54389994).

Almost surely, 2^108779987 is an apocalyptic number.

108779987 is a deficient number, since it is larger than the sum of its proper divisors (1).

108779987 is an equidigital number, since it uses as much as digits as its factorization.

108779987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The square root of 108779987 is about 10429.7644748096. The cubic root of 108779987 is about 477.3640039232.

The spelling of 108779987 in words is "one hundred eight million, seven hundred seventy-nine thousand, nine hundred eighty-seven".