521311340 has 24 divisors (see below), whose sum is σ = 1194277392. Its totient is φ = 189567680.

The previous prime is 521311333. The next prime is 521311391. The reversal of 521311340 is 43113125.

It is a super-3 number, since 3×521311340³ (a number of 27 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184579 + ... + 1185018.

It is an arithmetic number, because the mean of its divisors is an integer number (49761558).

Almost surely, 2^521311340 is an apocalyptic number.

It is an amenable number.

521311340 is an abundant number, since it is smaller than the sum of its proper divisors (672966052).

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

521311340 is a wasteful number, since it uses less digits than its factorization.

521311340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369617 (or 2369615 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 521311340 is about 22832.2434289756. The cubic root of 521311340 is about 804.8205507698.

Adding to 521311340 its reverse (43113125), we get a palindrome (564424465).

The spelling of 521311340 in words is "five hundred twenty-one million, three hundred eleven thousand, three hundred forty".