521445413 has 4 divisors (see below), whose sum is σ = 521564640. Its totient is φ = 521326188.

The previous prime is 521445409. The next prime is 521445467. The reversal of 521445413 is 314544125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521445413 - 2² = 521445409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521445493) 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, 52793 + ... + 61886.

It is an arithmetic number, because the mean of its divisors is an integer number (130391160).

Almost surely, 2^521445413 is an apocalyptic number.

It is an amenable number.

521445413 is a deficient number, since it is larger than the sum of its proper divisors (119227).

521445413 is a wasteful number, since it uses less digits than its factorization.

521445413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119226.

The product of its digits is 9600, while the sum is 29.

The square root of 521445413 is about 22835.1792854797. The cubic root of 521445413 is about 804.8895405451.

Adding to 521445413 its reverse (314544125), we get a palindrome (835989538).

The spelling of 521445413 in words is "five hundred twenty-one million, four hundred forty-five thousand, four hundred thirteen".