866747131 has 2 divisors, whose sum is σ = 866747132. Its totient is φ = 866747130.

The previous prime is 866747117. The next prime is 866747137. The reversal of 866747131 is 131747668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866747131 - 2⁷ = 866747003 is a prime.

It is a super-2 number, since 2×866747131² = 1502501178193462322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866747137) 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, 433373565 + 433373566.

It is an arithmetic number, because the mean of its divisors is an integer number (433373566).

Almost surely, 2^866747131 is an apocalyptic number.

866747131 is a deficient number, since it is larger than the sum of its proper divisors (1).

866747131 is an equidigital number, since it uses as much as digits as its factorization.

866747131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 866747131 is about 29440.5694747911. The cubic root of 866747131 is about 953.4490073369.

The spelling of 866747131 in words is "eight hundred sixty-six million, seven hundred forty-seven thousand, one hundred thirty-one".