521007061 has 4 divisors (see below), whose sum is σ = 521416332. Its totient is φ = 520597792.

The previous prime is 521006989. The next prime is 521007073. The reversal of 521007061 is 160700125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203062500 + 317944561 = 14250^2 + 17831^2 .

It is a cyclic number.

It is not a de Polignac number, because 521007061 - 2⁷ = 521006933 is a prime.

It is a super-2 number, since 2×521007061² = 542896715223715442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521007761) 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, 202720 + ... + 205273.

It is an arithmetic number, because the mean of its divisors is an integer number (130354083).

Almost surely, 2^521007061 is an apocalyptic number.

It is an amenable number.

521007061 is a deficient number, since it is larger than the sum of its proper divisors (409271).

521007061 is a wasteful number, since it uses less digits than its factorization.

521007061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409270.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 521007061 is about 22825.5790945159. The cubic root of 521007061 is about 804.6639344098.

Adding to 521007061 its reverse (160700125), we get a palindrome (681707186).

The spelling of 521007061 in words is "five hundred twenty-one million, seven thousand, sixty-one".