531440149 has 2 divisors, whose sum is σ = 531440150. Its totient is φ = 531440148.

The previous prime is 531440141. The next prime is 531440159. The reversal of 531440149 is 941044135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483692049 + 47748100 = 21993^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 531440149 - 2³ = 531440141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531440149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531440141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265720074 + 265720075.

It is an arithmetic number, because the mean of its divisors is an integer number (265720075).

Almost surely, 2^531440149 is an apocalyptic number.

It is an amenable number.

531440149 is a deficient number, since it is larger than the sum of its proper divisors (1).

531440149 is an equidigital number, since it uses as much as digits as its factorization.

531440149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 531440149 is about 23052.9856851558. The cubic root of 531440149 is about 809.9995676470. Note that the first 3 decimals are identical.

The spelling of 531440149 in words is "five hundred thirty-one million, four hundred forty thousand, one hundred forty-nine".