966423991 has 4 divisors (see below), whose sum is σ = 1040764312. Its totient is φ = 892083672.

The previous prime is 966423967. The next prime is 966424001. The reversal of 966423991 is 199324669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199324669 = 401 ⋅497069.

It is a cyclic number.

It is not a de Polignac number, because 966423991 - 2¹³ = 966415799 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 (966423691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37170141 + ... + 37170166.

It is an arithmetic number, because the mean of its divisors is an integer number (260191078).

Almost surely, 2^966423991 is an apocalyptic number.

966423991 is a deficient number, since it is larger than the sum of its proper divisors (74340321).

966423991 is a wasteful number, since it uses less digits than its factorization.

966423991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74340320.

The product of its digits is 629856, while the sum is 49.

The square root of 966423991 is about 31087.3606309703. The cubic root of 966423991 is about 988.6803459110.

The spelling of 966423991 in words is "nine hundred sixty-six million, four hundred twenty-three thousand, nine hundred ninety-one".