109947779 has 4 divisors (see below), whose sum is σ = 110016984. Its totient is φ = 109878576.

The previous prime is 109947769. The next prime is 109947791. The reversal of 109947779 is 977749901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977749901 = 37 ⋅26425673.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109947779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109947779.

It is not an unprimeable number, because it can be changed into a prime (109947769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32162 + ... + 35415.

It is an arithmetic number, because the mean of its divisors is an integer number (27504246).

Almost surely, 2^109947779 is an apocalyptic number.

109947779 is a deficient number, since it is larger than the sum of its proper divisors (69205).

109947779 is an equidigital number, since it uses as much as digits as its factorization.

109947779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69204.

The product of its (nonzero) digits is 1000188, while the sum is 53.

The square root of 109947779 is about 10485.5986476691. The cubic root of 109947779 is about 479.0661516633.

The spelling of 109947779 in words is "one hundred nine million, nine hundred forty-seven thousand, seven hundred seventy-nine".