1109551779 has 12 divisors (see below), whose sum is σ = 1831641136. Its totient is φ = 634029552.

The previous prime is 1109551693. The next prime is 1109551787. The reversal of 1109551779 is 9771559011.

It is a happy number.

It is not a de Polignac number, because 1109551779 - 2¹³ = 1109543587 is a prime.

It is a super-2 number, since 2×1109551779² = 2462210300564129682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109551679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8805904 + ... + 8806029.

Almost surely, 2^1109551779 is an apocalyptic number.

1109551779 is a deficient number, since it is larger than the sum of its proper divisors (722089357).

1109551779 is a wasteful number, since it uses less digits than its factorization.

1109551779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17611946 (or 17611943 counting only the distinct ones).

The product of its (nonzero) digits is 99225, while the sum is 45.

The square root of 1109551779 is about 33309.9351395346. The cubic root of 1109551779 is about 1035.2594210735.

The spelling of 1109551779 in words is "one billion, one hundred nine million, five hundred fifty-one thousand, seven hundred seventy-nine".