521045501 has 2 divisors, whose sum is σ = 521045502. Its totient is φ = 521045500.

The previous prime is 521045479. The next prime is 521045537. The reversal of 521045501 is 105540125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307125625 + 213919876 = 17525^2 + 14626^2 .

It is a cyclic number.

It is not a de Polignac number, because 521045501 - 2²² = 516851197 is a prime.

It is a super-2 number, since 2×521045501² = 542976828224682002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521045101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260522750 + 260522751.

It is an arithmetic number, because the mean of its divisors is an integer number (260522751).

Almost surely, 2^521045501 is an apocalyptic number.

It is an amenable number.

521045501 is a deficient number, since it is larger than the sum of its proper divisors (1).

521045501 is an equidigital number, since it uses as much as digits as its factorization.

521045501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 521045501 is about 22826.4211167673. The cubic root of 521045501 is about 804.6837233424.

Adding to 521045501 its reverse (105540125), we get a palindrome (626585626).

The spelling of 521045501 in words is "five hundred twenty-one million, forty-five thousand, five hundred one".