1521342545 has 4 divisors (see below), whose sum is σ = 1825611060. Its totient is φ = 1217074032.

The previous prime is 1521342527. The next prime is 1521342551. The reversal of 1521342545 is 5452431251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1123858576 + 397483969 = 33524^2 + 19937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521342545 - 2⁶ = 1521342481 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152134250 + ... + 152134259.

It is an arithmetic number, because the mean of its divisors is an integer number (456402765).

Almost surely, 2^1521342545 is an apocalyptic number.

It is an amenable number.

1521342545 is a deficient number, since it is larger than the sum of its proper divisors (304268515).

1521342545 is an equidigital number, since it uses as much as digits as its factorization.

1521342545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304268514.

The product of its digits is 24000, while the sum is 32.

The square root of 1521342545 is about 39004.3913553333. The cubic root of 1521342545 is about 1150.1178316566.

Adding to 1521342545 its reverse (5452431251), we get a palindrome (6973773796).

The spelling of 1521342545 in words is "one billion, five hundred twenty-one million, three hundred forty-two thousand, five hundred forty-five".