521540052 has 48 divisors (see below), whose sum is σ = 1329011712. Its totient is φ = 157869280.

The previous prime is 521540051. The next prime is 521540053. The reversal of 521540052 is 250045125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (521540051) and next prime (521540053).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521540051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171013 + ... + 174035.

It is an arithmetic number, because the mean of its divisors is an integer number (27687744).

Almost surely, 2^521540052 is an apocalyptic number.

It is an amenable number.

521540052 is an abundant number, since it is smaller than the sum of its proper divisors (807471660).

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

521540052 is a wasteful number, since it uses less digits than its factorization.

521540052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348 (or 4346 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 521540052 is about 22837.2514107981. The cubic root of 521540052 is about 804.9382316969.

Adding to 521540052 its reverse (250045125), we get a palindrome (771585177).

The spelling of 521540052 in words is "five hundred twenty-one million, five hundred forty thousand, fifty-two".