1533661541 has 2 divisors, whose sum is σ = 1533661542. Its totient is φ = 1533661540.

The previous prime is 1533661537. The next prime is 1533661603. The reversal of 1533661541 is 1451663351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1261741441 + 271920100 = 35521^2 + 16490^2 .

It is an emirp because it is prime and its reverse (1451663351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1533661541 - 2² = 1533661537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1533621541) 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, 766830770 + 766830771.

It is an arithmetic number, because the mean of its divisors is an integer number (766830771).

Almost surely, 2^1533661541 is an apocalyptic number.

It is an amenable number.

1533661541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1533661541 is an equidigital number, since it uses as much as digits as its factorization.

1533661541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 1533661541 is about 39161.9910244615. The cubic root of 1533661541 is about 1153.2138308156.

The spelling of 1533661541 in words is "one billion, five hundred thirty-three million, six hundred sixty-one thousand, five hundred forty-one".