521495140 has 12 divisors (see below), whose sum is σ = 1095139836. Its totient is φ = 208598048.

The previous prime is 521495129. The next prime is 521495141. The reversal of 521495140 is 41594125.

It can be written as a sum of positive squares in 2 ways, for example, as 224760064 + 296735076 = 14992^2 + 17226^2 .

It is not an unprimeable number, because it can be changed into a prime (521495141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13037359 + ... + 13037398.

It is an arithmetic number, because the mean of its divisors is an integer number (91261653).

Almost surely, 2^521495140 is an apocalyptic number.

It is an amenable number.

521495140 is an abundant number, since it is smaller than the sum of its proper divisors (573644696).

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

521495140 is a wasteful number, since it uses less digits than its factorization.

521495140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26074766 (or 26074764 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 521495140 is about 22836.2680839055. The cubic root of 521495140 is about 804.9151254986.

The spelling of 521495140 in words is "five hundred twenty-one million, four hundred ninety-five thousand, one hundred forty".