1521350645 has 16 divisors (see below), whose sum is σ = 1876604160. Its totient is φ = 1183149504.

The previous prime is 1521350641. The next prime is 1521350647. The reversal of 1521350645 is 5460531251.

It is a cyclic number.

It is not a de Polignac number, because 1521350645 - 2² = 1521350641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521350641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260366 + ... + 266144.

It is an arithmetic number, because the mean of its divisors is an integer number (117287760).

Almost surely, 2^1521350645 is an apocalyptic number.

It is an amenable number.

1521350645 is a deficient number, since it is larger than the sum of its proper divisors (355253515).

1521350645 is a wasteful number, since it uses less digits than its factorization.

1521350645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7244.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1521350645 is about 39004.4951896573. The cubic root of 1521350645 is about 1150.1198728226.

Adding to 1521350645 its reverse (5460531251), we get a palindrome (6981881896).

The spelling of 1521350645 in words is "one billion, five hundred twenty-one million, three hundred fifty thousand, six hundred forty-five".