1521330145 has 8 divisors (see below), whose sum is σ = 1826017704. Its totient is φ = 1216783104.

The previous prime is 1521330143. The next prime is 1521330149. The reversal of 1521330145 is 5410331251.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 414570321 + 1106759824 = 20361^2 + 33268^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521330145 - 2¹ = 1521330143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521330143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9624 + ... + 55993.

It is an arithmetic number, because the mean of its divisors is an integer number (228252213).

Almost surely, 2^1521330145 is an apocalyptic number.

It is an amenable number.

1521330145 is a deficient number, since it is larger than the sum of its proper divisors (304687559).

1521330145 is an equidigital number, since it uses as much as digits as its factorization.

1521330145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70259.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1521330145 is about 39004.2323985488. The cubic root of 1521330145 is about 1150.1147068946.

Adding to 1521330145 its reverse (5410331251), we get a palindrome (6931661396).

The spelling of 1521330145 in words is "one billion, five hundred twenty-one million, three hundred thirty thousand, one hundred forty-five".