531681131 has 2 divisors, whose sum is σ = 531681132. Its totient is φ = 531681130.

The previous prime is 531681097. The next prime is 531681167. The reversal of 531681131 is 131186135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531681131 - 2⁶ = 531681067 is a prime.

It is a super-2 number, since 2×531681131² = 565369650122878322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 531681094 and 531681103.

It is not a weakly prime, because it can be changed into another prime (531681191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265840565 + 265840566.

It is an arithmetic number, because the mean of its divisors is an integer number (265840566).

Almost surely, 2^531681131 is an apocalyptic number.

531681131 is a deficient number, since it is larger than the sum of its proper divisors (1).

531681131 is an equidigital number, since it uses as much as digits as its factorization.

531681131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 531681131 is about 23058.2117910301. The cubic root of 531681131 is about 810.1219808167.

The spelling of 531681131 in words is "five hundred thirty-one million, six hundred eighty-one thousand, one hundred thirty-one".