1955109879 has 20 divisors (see below), whose sum is σ = 2935752336. Its totient is φ = 1296642816.

The previous prime is 1955109869. The next prime is 1955109883. The reversal of 1955109879 is 9789015591.

1955109879 is a `hidden beast` number, since 1 + 9 + 551 + 0 + 9 + 87 + 9 = 666.

It is not a de Polignac number, because 1955109879 - 2⁸ = 1955109623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955109839) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46899 + ... + 78164.

Almost surely, 2^1955109879 is an apocalyptic number.

1955109879 is a deficient number, since it is larger than the sum of its proper divisors (980642457).

1955109879 is a wasteful number, since it uses less digits than its factorization.

1955109879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125268 (or 125259 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 54.

The square root of 1955109879 is about 44216.6244641085. The cubic root of 1955109879 is about 1250.4232974925.

The spelling of 1955109879 in words is "one billion, nine hundred fifty-five million, one hundred nine thousand, eight hundred seventy-nine".