1963646081 has 4 divisors (see below), whose sum is σ = 2079154692. Its totient is φ = 1848137472.

The previous prime is 1963646063. The next prime is 1963646099. The reversal of 1963646081 is 1806463691.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1963646063) and next prime (1963646099).

It can be written as a sum of positive squares in 2 ways, for example, as 1786330225 + 177315856 = 42265^2 + 13316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963646081 - 2¹⁴ = 1963629697 is a prime.

It is a super-2 number, since 2×1963646081² = 7711811862853317122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1963646011) 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, 57754280 + ... + 57754313.

It is an arithmetic number, because the mean of its divisors is an integer number (519788673).

Almost surely, 2^1963646081 is an apocalyptic number.

It is an amenable number.

1963646081 is a deficient number, since it is larger than the sum of its proper divisors (115508611).

1963646081 is a wasteful number, since it uses less digits than its factorization.

1963646081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115508610.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1963646081 is about 44313.0463971955. The cubic root of 1963646081 is about 1252.2404790835.

The spelling of 1963646081 in words is "one billion, nine hundred sixty-three million, six hundred forty-six thousand, eighty-one".