955978691 has 4 divisors (see below), whose sum is σ = 957252384. Its totient is φ = 954705000.

The previous prime is 955978679. The next prime is 955978769. The reversal of 955978691 is 196879559.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196879559 = 281 ⋅700639.

It is a cyclic number.

It is not a de Polignac number, because 955978691 - 2¹⁰ = 955977667 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 955978691.

It is not an unprimeable number, because it can be changed into a prime (955938691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635720 + ... + 637221.

It is an arithmetic number, because the mean of its divisors is an integer number (239313096).

Almost surely, 2^955978691 is an apocalyptic number.

955978691 is a deficient number, since it is larger than the sum of its proper divisors (1273693).

955978691 is a wasteful number, since it uses less digits than its factorization.

955978691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273692.

The product of its digits is 6123600, while the sum is 59.

The square root of 955978691 is about 30918.9050744039. The cubic root of 955978691 is about 985.1054851944.

The spelling of 955978691 in words is "nine hundred fifty-five million, nine hundred seventy-eight thousand, six hundred ninety-one".