521020461 has 16 divisors (see below), whose sum is σ = 752621184. Its totient is φ = 318704064.

The previous prime is 521020447. The next prime is 521020463. The reversal of 521020461 is 164020125.

It is not a de Polignac number, because 521020461 - 2⁶ = 521020397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521020463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33486 + ... + 46511.

It is an arithmetic number, because the mean of its divisors is an integer number (47038824).

Almost surely, 2^521020461 is an apocalyptic number.

It is an amenable number.

521020461 is a deficient number, since it is larger than the sum of its proper divisors (231600723).

521020461 is a wasteful number, since it uses less digits than its factorization.

521020461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80180.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 521020461 is about 22825.8726229689. The cubic root of 521020461 is about 804.6708328475.

Adding to 521020461 its reverse (164020125), we get a palindrome (685040586).

The spelling of 521020461 in words is "five hundred twenty-one million, twenty thousand, four hundred sixty-one".