1531500331541 has 2 divisors, whose sum is σ = 1531500331542. Its totient is φ = 1531500331540.

The previous prime is 1531500331441. The next prime is 1531500331579. The reversal of 1531500331541 is 1451330051351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1498641156100 + 32859175441 = 1224190^2 + 181271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531500331541 - 2²⁶ = 1531433222677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1531500331498 and 1531500331507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531500331441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765750165770 + 765750165771.

It is an arithmetic number, because the mean of its divisors is an integer number (765750165771).

Almost surely, 2^{1531500331541} is an apocalyptic number.

It is an amenable number.

1531500331541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531500331541 is an equidigital number, since it uses as much as digits as its factorization.

1531500331541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13500, while the sum is 32.

Adding to 1531500331541 its reverse (1451330051351), we get a palindrome (2982830382892).

The spelling of 1531500331541 in words is "one trillion, five hundred thirty-one billion, five hundred million, three hundred thirty-one thousand, five hundred forty-one".