1520135514 has 48 divisors (see below), whose sum is σ = 3415131720. Its totient is φ = 488100480.

The previous prime is 1520135503. The next prime is 1520135569. The reversal of 1520135514 is 4155310251.

1520135514 is a `hidden beast` number, since 1 + 520 + 135 + 5 + 1 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1228853025 + 291282489 = 35055^2 + 17067^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 237484 + ... + 243800.

Almost surely, 2^1520135514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1520135514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707565860).

1520135514 is an abundant number, since it is smaller than the sum of its proper divisors (1894996206).

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

1520135514 is a wasteful number, since it uses less digits than its factorization.

1520135514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6815 (or 6812 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1520135514 is about 38988.9152708818. The cubic root of 1520135514 is about 1149.8135838981.

Adding to 1520135514 its reverse (4155310251), we get a palindrome (5675445765).

The spelling of 1520135514 in words is "one billion, five hundred twenty million, one hundred thirty-five thousand, five hundred fourteen".