1520545541 has 4 divisors (see below), whose sum is σ = 1521659232. Its totient is φ = 1519431852.

The previous prime is 1520545517. The next prime is 1520545561. The reversal of 1520545541 is 1455450251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1455450251 = 293 ⋅4967407.

It is a cyclic number.

It is not a de Polignac number, because 1520545541 - 2¹⁸ = 1520283397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1520545498 and 1520545507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520545561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554795 + ... + 557528.

It is an arithmetic number, because the mean of its divisors is an integer number (380414808).

Almost surely, 2^1520545541 is an apocalyptic number.

It is an amenable number.

1520545541 is a deficient number, since it is larger than the sum of its proper divisors (1113691).

1520545541 is a wasteful number, since it uses less digits than its factorization.

1520545541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113690.

The product of its (nonzero) digits is 20000, while the sum is 32.

The square root of 1520545541 is about 38994.1731672823. The cubic root of 1520545541 is about 1149.9169545577.

Adding to 1520545541 its reverse (1455450251), we get a palindrome (2975995792).

The spelling of 1520545541 in words is "one billion, five hundred twenty million, five hundred forty-five thousand, five hundred forty-one".