1965845213 has 4 divisors (see below), whose sum is σ = 2051316768. Its totient is φ = 1880373660.

The previous prime is 1965845209. The next prime is 1965845237. The reversal of 1965845213 is 3125485691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1965845213 - 2² = 1965845209 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 (1965844213) 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, 42735743 + ... + 42735788.

It is an arithmetic number, because the mean of its divisors is an integer number (512829192).

Almost surely, 2^1965845213 is an apocalyptic number.

It is an amenable number.

1965845213 is a deficient number, since it is larger than the sum of its proper divisors (85471555).

1965845213 is an equidigital number, since it uses as much as digits as its factorization.

1965845213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85471554.

The product of its digits is 259200, while the sum is 44.

The square root of 1965845213 is about 44337.8530490596. The cubic root of 1965845213 is about 1252.7077755658.

The spelling of 1965845213 in words is "one billion, nine hundred sixty-five million, eight hundred forty-five thousand, two hundred thirteen".