1023763649 has 6 divisors (see below), whose sum is σ = 1070210946. Its totient is φ = 979251680.

The previous prime is 1023763639. The next prime is 1023763661. The reversal of 1023763649 is 9463673201.

It can be written as a sum of positive squares in only one way, i.e., 1023552049 + 211600 = 31993^2 + 460^2 .

It is not a de Polignac number, because 1023763649 - 2⁴ = 1023763633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1023763639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 967112 + ... + 968169.

It is an arithmetic number, because the mean of its divisors is an integer number (178368491).

Almost surely, 2^1023763649 is an apocalyptic number.

It is an amenable number.

1023763649 is a deficient number, since it is larger than the sum of its proper divisors (46447297).

1023763649 is an equidigital number, since it uses as much as digits as its factorization.

1023763649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935327 (or 1935304 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 1023763649 is about 31996.3068025046. The cubic root of 1023763649 is about 1007.8592861363.

The spelling of 1023763649 in words is "one billion, twenty-three million, seven hundred sixty-three thousand, six hundred forty-nine".