1955291691 has 8 divisors (see below), whose sum is σ = 2744269120. Its totient is φ = 1234921032.

The previous prime is 1955291609. The next prime is 1955291707. The reversal of 1955291691 is 1961925591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1955291691 - 2¹¹ = 1955289643 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 1955291691.

It is not an unprimeable number, because it can be changed into a prime (1955298691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17151625 + ... + 17151738.

It is an arithmetic number, because the mean of its divisors is an integer number (343033640).

Almost surely, 2^1955291691 is an apocalyptic number.

1955291691 is a deficient number, since it is larger than the sum of its proper divisors (788977429).

1955291691 is a wasteful number, since it uses less digits than its factorization.

1955291691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34303385.

The product of its digits is 218700, while the sum is 48.

The square root of 1955291691 is about 44218.6803398745. The cubic root of 1955291691 is about 1250.4620565953.

The spelling of 1955291691 in words is "one billion, nine hundred fifty-five million, two hundred ninety-one thousand, six hundred ninety-one".