1521520245 has 24 divisors (see below), whose sum is σ = 3014059776. Its totient is φ = 695551968.

The previous prime is 1521520229. The next prime is 1521520249. The reversal of 1521520245 is 5420251251.

It is not a de Polignac number, because 1521520245 - 2⁴ = 1521520229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521520249) 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, 2414797 + ... + 2415426.

It is an arithmetic number, because the mean of its divisors is an integer number (125585824).

Almost surely, 2^1521520245 is an apocalyptic number.

1521520245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1521520245 is a deficient number, since it is larger than the sum of its proper divisors (1492539531).

1521520245 is a wasteful number, since it uses less digits than its factorization.

1521520245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830241 (or 4830238 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1521520245 is about 39006.6692374522. The cubic root of 1521520245 is about 1150.1626096462.

Adding to 1521520245 its reverse (5420251251), we get a palindrome (6941771496).

The spelling of 1521520245 in words is "one billion, five hundred twenty-one million, five hundred twenty thousand, two hundred forty-five".