1521315140 has 24 divisors (see below), whose sum is σ = 3195521280. Its totient is φ = 608381408.

The previous prime is 1521315121. The next prime is 1521315149. The reversal of 1521315140 is 415131251.

1521315140 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1521315149) 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, 127469 + ... + 138891.

It is an arithmetic number, because the mean of its divisors is an integer number (133146720).

Almost surely, 2^1521315140 is an apocalyptic number.

1521315140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521315140 is an abundant number, since it is smaller than the sum of its proper divisors (1674206140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1521315140 is a wasteful number, since it uses less digits than its factorization.

1521315140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18091 (or 18089 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1521315140 is about 39004.0400471541. The cubic root of 1521315140 is about 1150.1109256580.

Adding to 1521315140 its reverse (415131251), we get a palindrome (1936446391).

The spelling of 1521315140 in words is "one billion, five hundred twenty-one million, three hundred fifteen thousand, one hundred forty".