1964697791 has 4 divisors (see below), whose sum is σ = 2245368912. Its totient is φ = 1684026672.

The previous prime is 1964697751. The next prime is 1964697797. The reversal of 1964697791 is 1977964691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1977964691 = 29 ⋅68205679.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1964697791 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 1964697791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964697797) 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, 140335550 + ... + 140335563.

It is an arithmetic number, because the mean of its divisors is an integer number (561342228).

Almost surely, 2^1964697791 is an apocalyptic number.

1964697791 is a deficient number, since it is larger than the sum of its proper divisors (280671121).

1964697791 is an equidigital number, since it uses as much as digits as its factorization.

1964697791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280671120.

The product of its digits is 5143824, while the sum is 59.

The square root of 1964697791 is about 44324.9116299175. The cubic root of 1964697791 is about 1252.4640018445.

The spelling of 1964697791 in words is "one billion, nine hundred sixty-four million, six hundred ninety-seven thousand, seven hundred ninety-one".