1531439149 has 2 divisors, whose sum is σ = 1531439150. Its totient is φ = 1531439148.

The previous prime is 1531439089. The next prime is 1531439177. The reversal of 1531439149 is 9419341351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1472256900 + 59182249 = 38370^2 + 7693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531439149 - 2¹⁵ = 1531406381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531439179) 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, 765719574 + 765719575.

It is an arithmetic number, because the mean of its divisors is an integer number (765719575).

Almost surely, 2^1531439149 is an apocalyptic number.

It is an amenable number.

1531439149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531439149 is an equidigital number, since it uses as much as digits as its factorization.

1531439149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 1531439149 is about 39133.6063888827. The cubic root of 1531439149 is about 1152.6565300763.

The spelling of 1531439149 in words is "one billion, five hundred thirty-one million, four hundred thirty-nine thousand, one hundred forty-nine".