1964069813 has 4 divisors (see below), whose sum is σ = 2001127788. Its totient is φ = 1927011840.

The previous prime is 1964069791. The next prime is 1964069827. The reversal of 1964069813 is 3189604691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 469242244 + 1494827569 = 21662^2 + 38663^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964069813 - 2¹² = 1964065717 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 (1964069893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18528908 + ... + 18529013.

It is an arithmetic number, because the mean of its divisors is an integer number (500281947).

Almost surely, 2^1964069813 is an apocalyptic number.

It is an amenable number.

1964069813 is a deficient number, since it is larger than the sum of its proper divisors (37057975).

1964069813 is an equidigital number, since it uses as much as digits as its factorization.

1964069813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37057974.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1964069813 is about 44317.8272594675. The cubic root of 1964069813 is about 1252.3305455854.

The spelling of 1964069813 in words is "one billion, nine hundred sixty-four million, sixty-nine thousand, eight hundred thirteen".