1531607149 has 2 divisors, whose sum is σ = 1531607150. Its totient is φ = 1531607148.

The previous prime is 1531607123. The next prime is 1531607159. The reversal of 1531607149 is 9417061351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1498464100 + 33143049 = 38710^2 + 5757^2 .

It is an emirp because it is prime and its reverse (9417061351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1531607149 - 2⁵ = 1531607117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531607159) 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, 765803574 + 765803575.

It is an arithmetic number, because the mean of its divisors is an integer number (765803575).

Almost surely, 2^1531607149 is an apocalyptic number.

It is an amenable number.

1531607149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531607149 is an equidigital number, since it uses as much as digits as its factorization.

1531607149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 1531607149 is about 39135.7528227068. The cubic root of 1531607149 is about 1152.6986776246.

The spelling of 1531607149 in words is "one billion, five hundred thirty-one million, six hundred seven thousand, one hundred forty-nine".