1964771997 has 8 divisors (see below), whose sum is σ = 2662642080. Its totient is φ = 1288374960.

The previous prime is 1964771983. The next prime is 1964772001. The reversal of 1964771997 is 7991774691.

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

It is not a de Polignac number, because 1964771997 - 2¹¹ = 1964769949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1964771997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964771927) 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, 5368047 + ... + 5368412.

It is an arithmetic number, because the mean of its divisors is an integer number (332830260).

Almost surely, 2^1964771997 is an apocalyptic number.

It is an amenable number.

1964771997 is a deficient number, since it is larger than the sum of its proper divisors (697870083).

1964771997 is a wasteful number, since it uses less digits than its factorization.

1964771997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10736523.

The product of its digits is 6001128, while the sum is 60.

The square root of 1964771997 is about 44325.7486908005. The cubic root of 1964771997 is about 1252.4797700327.

The spelling of 1964771997 in words is "one billion, nine hundred sixty-four million, seven hundred seventy-one thousand, nine hundred ninety-seven".