1965163549 has 2 divisors, whose sum is σ = 1965163550. Its totient is φ = 1965163548.

The previous prime is 1965163537. The next prime is 1965163663. The reversal of 1965163549 is 9453615691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1922822500 + 42341049 = 43850^2 + 6507^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965163549 - 2²⁷ = 1830945821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1965163349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982581774 + 982581775.

It is an arithmetic number, because the mean of its divisors is an integer number (982581775).

Almost surely, 2^1965163549 is an apocalyptic number.

It is an amenable number.

1965163549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965163549 is an equidigital number, since it uses as much as digits as its factorization.

1965163549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 49.

The square root of 1965163549 is about 44330.1652264009. The cubic root of 1965163549 is about 1252.5629651627.

The spelling of 1965163549 in words is "one billion, nine hundred sixty-five million, one hundred sixty-three thousand, five hundred forty-nine".