521140506 has 8 divisors (see below), whose sum is σ = 1042281024. Its totient is φ = 173713500.

The previous prime is 521140489. The next prime is 521140517. The reversal of 521140506 is 605041125.

It is a sphenic number, since it is the product of 3 distinct primes.

521140506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43428370 + ... + 43428381.

It is an arithmetic number, because the mean of its divisors is an integer number (130285128).

Almost surely, 2^521140506 is an apocalyptic number.

521140506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521140506 is a wasteful number, since it uses less digits than its factorization.

521140506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86856756.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 521140506 is about 22828.5020533543. The cubic root of 521140506 is about 804.7326277926.

The spelling of 521140506 in words is "five hundred twenty-one million, one hundred forty thousand, five hundred six".