1531523141 has 2 divisors, whose sum is σ = 1531523142. Its totient is φ = 1531523140.

The previous prime is 1531523083. The next prime is 1531523159. The reversal of 1531523141 is 1413251351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1104232900 + 427290241 = 33230^2 + 20671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531523141 is a prime.

It is a super-3 number, since 3×1531523141³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1531523141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531523041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765761570 + 765761571.

It is an arithmetic number, because the mean of its divisors is an integer number (765761571).

Almost surely, 2^1531523141 is an apocalyptic number.

It is an amenable number.

1531523141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531523141 is an equidigital number, since it uses as much as digits as its factorization.

1531523141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 1531523141 is about 39134.6795182994. The cubic root of 1531523141 is about 1152.6776022287.

Adding to 1531523141 its reverse (1413251351), we get a palindrome (2944774492).

The spelling of 1531523141 in words is "one billion, five hundred thirty-one million, five hundred twenty-three thousand, one hundred forty-one".