1965369813 has 64 divisors (see below), whose sum is σ = 3120353280. Its totient is φ = 1086924800.

The previous prime is 1965369793. The next prime is 1965369841. The reversal of 1965369813 is 3189635691.

It is a cyclic number.

It is not a de Polignac number, because 1965369813 - 2¹³ = 1965361621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965369013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3453793 + ... + 3454361.

It is an arithmetic number, because the mean of its divisors is an integer number (48755520).

Almost surely, 2^1965369813 is an apocalyptic number.

It is an amenable number.

1965369813 is a deficient number, since it is larger than the sum of its proper divisors (1154983467).

1965369813 is a wasteful number, since it uses less digits than its factorization.

1965369813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778.

The product of its digits is 1049760, while the sum is 51.

The square root of 1965369813 is about 44332.4916173228. The cubic root of 1965369813 is about 1252.6067867247.

The spelling of 1965369813 in words is "one billion, nine hundred sixty-five million, three hundred sixty-nine thousand, eight hundred thirteen".