109777987 has 4 divisors (see below), whose sum is σ = 119757816. Its totient is φ = 99798160.

The previous prime is 109777973. The next prime is 109778023. The reversal of 109777987 is 789777901.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 109777987 - 2¹⁹ = 109253699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109777957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4989898 + ... + 4989919.

It is an arithmetic number, because the mean of its divisors is an integer number (29939454).

Almost surely, 2^109777987 is an apocalyptic number.

109777987 is a deficient number, since it is larger than the sum of its proper divisors (9979829).

109777987 is an equidigital number, since it uses as much as digits as its factorization.

109777987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9979828.

The product of its (nonzero) digits is 1555848, while the sum is 55.

The square root of 109777987 is about 10477.4990813648. The cubic root of 109777987 is about 478.8194178394.

The spelling of 109777987 in words is "one hundred nine million, seven hundred seventy-seven thousand, nine hundred eighty-seven".