531040981 has 2 divisors, whose sum is σ = 531040982. Its totient is φ = 531040980.

The previous prime is 531040967. The next prime is 531040999. The reversal of 531040981 is 189040135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499299025 + 31741956 = 22345^2 + 5634^2 .

It is a cyclic number.

It is not a de Polignac number, because 531040981 - 2¹¹ = 531038933 is a prime.

It is a super-2 number, since 2×531040981² = 564009047002884722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531040681) 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, 265520490 + 265520491.

It is an arithmetic number, because the mean of its divisors is an integer number (265520491).

Almost surely, 2^531040981 is an apocalyptic number.

It is an amenable number.

531040981 is a deficient number, since it is larger than the sum of its proper divisors (1).

531040981 is an equidigital number, since it uses as much as digits as its factorization.

531040981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 531040981 is about 23044.3264384100. The cubic root of 531040981 is about 809.7967182810.

The spelling of 531040981 in words is "five hundred thirty-one million, forty thousand, nine hundred eighty-one".