521481577 has 4 divisors (see below), whose sum is σ = 521897040. Its totient is φ = 521066116.

The previous prime is 521481547. The next prime is 521481593. The reversal of 521481577 is 775184125.

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 521481577 - 2¹⁹ = 520957289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521481547) 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, 205843 + ... + 208360.

It is an arithmetic number, because the mean of its divisors is an integer number (130474260).

Almost surely, 2^521481577 is an apocalyptic number.

It is an amenable number.

521481577 is a deficient number, since it is larger than the sum of its proper divisors (415463).

521481577 is a wasteful number, since it uses less digits than its factorization.

521481577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415462.

The product of its digits is 78400, while the sum is 40.

The square root of 521481577 is about 22835.9711201429. The cubic root of 521481577 is about 804.9081473841.

The spelling of 521481577 in words is "five hundred twenty-one million, four hundred eighty-one thousand, five hundred seventy-seven".