8505725731 has 2 divisors, whose sum is σ = 8505725732. Its totient is φ = 8505725730.

The previous prime is 8505725699. The next prime is 8505725741. The reversal of 8505725731 is 1375275058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8505725731 - 2⁵ = 8505725699 is a prime.

It is a super-2 number, since 2×8505725731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8505725741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252862865 + 4252862866.

It is an arithmetic number, because the mean of its divisors is an integer number (4252862866).

Almost surely, 2^8505725731 is an apocalyptic number.

8505725731 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505725731 is an equidigital number, since it uses as much as digits as its factorization.

8505725731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 43.

The square root of 8505725731 is about 92226.4914815694. The cubic root of 8505725731 is about 2041.2856924007.

The spelling of 8505725731 in words is "eight billion, five hundred five million, seven hundred twenty-five thousand, seven hundred thirty-one".