1026563999 has 4 divisors (see below), whose sum is σ = 1039558560. Its totient is φ = 1013569440.

The previous prime is 1026563957. The next prime is 1026564047. The reversal of 1026563999 is 9993656201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993656201 = 47 ⋅212630983.

It is a cyclic number.

It is not a de Polignac number, because 1026563999 - 2²⁴ = 1009786783 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 (1026563099) 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, 6497162 + ... + 6497319.

It is an arithmetic number, because the mean of its divisors is an integer number (259889640).

Almost surely, 2^1026563999 is an apocalyptic number.

1026563999 is a deficient number, since it is larger than the sum of its proper divisors (12994561).

1026563999 is an equidigital number, since it uses as much as digits as its factorization.

1026563999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12994560.

The product of its (nonzero) digits is 787320, while the sum is 50.

The square root of 1026563999 is about 32040.0374375562. The cubic root of 1026563999 is about 1008.7773982026. Note that the first 3 decimals are identical.

The spelling of 1026563999 in words is "one billion, twenty-six million, five hundred sixty-three thousand, nine hundred ninety-nine".