1563250081 has 2 divisors, whose sum is σ = 1563250082. Its totient is φ = 1563250080.

The previous prime is 1563250069. The next prime is 1563250103. The reversal of 1563250081 is 1800523651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1451229025 + 112021056 = 38095^2 + 10584^2 .

It is a cyclic number.

It is not a de Polignac number, because 1563250081 - 2⁵ = 1563250049 is a prime.

It is a super-2 number, since 2×1563250081² = 4887501631493013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1563200081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 781625040 + 781625041.

It is an arithmetic number, because the mean of its divisors is an integer number (781625041).

Almost surely, 2^1563250081 is an apocalyptic number.

It is an amenable number.

1563250081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1563250081 is an equidigital number, since it uses as much as digits as its factorization.

1563250081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1563250081 is about 39537.9574712706. The cubic root of 1563250081 is about 1160.5828623035.

It can be divided in two parts, 156325008 and 1, that added together give a square (156325009 = 12503²).

The spelling of 1563250081 in words is "one billion, five hundred sixty-three million, two hundred fifty thousand, eighty-one".