8261931563 has 2 divisors, whose sum is σ = 8261931564. Its totient is φ = 8261931562.

The previous prime is 8261931497. The next prime is 8261931589. The reversal of 8261931563 is 3651391628.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8261931563 - 2¹² = 8261927467 is a prime.

It is not a weakly prime, because it can be changed into another prime (8261931163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130965781 + 4130965782.

It is an arithmetic number, because the mean of its divisors is an integer number (4130965782).

Almost surely, 2^8261931563 is an apocalyptic number.

8261931563 is a deficient number, since it is larger than the sum of its proper divisors (1).

8261931563 is an equidigital number, since it uses as much as digits as its factorization.

8261931563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 8261931563 is about 90895.1679848825. The cubic root of 8261931563 is about 2021.5936483579.

The spelling of 8261931563 in words is "eight billion, two hundred sixty-one million, nine hundred thirty-one thousand, five hundred sixty-three".