1525521040 has 40 divisors (see below), whose sum is σ = 3549078648. Its totient is φ = 609822720.

The previous prime is 1525521031. The next prime is 1525521043. The reversal of 1525521040 is 401255251.

It can be written as a sum of positive squares in 4 ways, for example, as 5456896 + 1520064144 = 2336^2 + 38988^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1525520996 and 1525521014.

It is not an unprimeable number, because it can be changed into a prime (1525521043) 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, 144750 + ... + 154930.

Almost surely, 2^1525521040 is an apocalyptic number.

1525521040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1525521040 is an abundant number, since it is smaller than the sum of its proper divisors (2023557608).

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

1525521040 is a wasteful number, since it uses less digits than its factorization.

1525521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12067 (or 12061 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1525521040 is about 39057.9190433899. The cubic root of 1525521040 is about 1151.1698341608.

Adding to 1525521040 its reverse (401255251), we get a palindrome (1926776291).

The spelling of 1525521040 in words is "one billion, five hundred twenty-five million, five hundred twenty-one thousand, forty".