1523720513 has 24 divisors (see below), whose sum is σ = 1790712000. Its totient is φ = 1292705568.

The previous prime is 1523720477. The next prime is 1523720521. The reversal of 1523720513 is 3150273251.

It is not a de Polignac number, because 1523720513 - 2⁶ = 1523720449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1523720593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2993303 + ... + 2993811.

It is an arithmetic number, because the mean of its divisors is an integer number (74613000).

Almost surely, 2^1523720513 is an apocalyptic number.

It is an amenable number.

1523720513 is a deficient number, since it is larger than the sum of its proper divisors (266991487).

1523720513 is a wasteful number, since it uses less digits than its factorization.

1523720513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 1523720513 is about 39034.8627895629. The cubic root of 1523720513 is about 1150.7167587191.

Adding to 1523720513 its reverse (3150273251), we get a palindrome (4673993764).

The spelling of 1523720513 in words is "one billion, five hundred twenty-three million, seven hundred twenty thousand, five hundred thirteen".