521125040 has 40 divisors (see below), whose sum is σ = 1214038368. Its totient is φ = 208033280.

The previous prime is 521125037. The next prime is 521125043. The reversal of 521125040 is 40521125.

It is an interprime number because it is at equal distance from previous prime (521125037) and next prime (521125043).

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (521125043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35429 + ... + 47931.

Almost surely, 2^521125040 is an apocalyptic number.

It is an amenable number.

521125040 is an abundant number, since it is smaller than the sum of its proper divisors (692913328).

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

521125040 is a wasteful number, since it uses less digits than its factorization.

521125040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13037 (or 13031 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 521125040 is about 22828.1633076338. The cubic root of 521125040 is about 804.7246669722.

Adding to 521125040 its reverse (40521125), we get a palindrome (561646165).

The spelling of 521125040 in words is "five hundred twenty-one million, one hundred twenty-five thousand, forty".