1955916109 has 4 divisors (see below), whose sum is σ = 2235332704. Its totient is φ = 1676499516.

The previous prime is 1955916091. The next prime is 1955916133. The reversal of 1955916109 is 9016195591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1955916109 - 2⁷ = 1955915981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955913109) 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, 139708287 + ... + 139708300.

It is an arithmetic number, because the mean of its divisors is an integer number (558833176).

Almost surely, 2^1955916109 is an apocalyptic number.

It is an amenable number.

1955916109 is a deficient number, since it is larger than the sum of its proper divisors (279416595).

1955916109 is an equidigital number, since it uses as much as digits as its factorization.

1955916109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279416594.

The product of its (nonzero) digits is 109350, while the sum is 46.

The square root of 1955916109 is about 44225.7403442837. The cubic root of 1955916109 is about 1250.5951531759.

The spelling of 1955916109 in words is "one billion, nine hundred fifty-five million, nine hundred sixteen thousand, one hundred nine".