521377 has 2 divisors, whose sum is σ = 521378. Its totient is φ = 521376.

The previous prime is 521369. The next prime is 521393. The reversal of 521377 is 773125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474721 + 46656 = 689^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 521377 - 2³ = 521369 is a prime.

It is a super-2 number, since 2×521377² = 543667952258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260688 + 260689.

It is an arithmetic number, because the mean of its divisors is an integer number (260689).

2⁵²¹³⁷⁷ is an apocalyptic number.

It is an amenable number.

521377 is a deficient number, since it is larger than the sum of its proper divisors (1).

521377 is an equidigital number, since it uses as much as digits as its factorization.

521377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1470, while the sum is 25.

The square root of 521377 is about 722.0644015599. The cubic root of 521377 is about 80.4854338831.

It can be divided in two parts, 521 and 377, that added together give a palindrome (898).

The spelling of 521377 in words is "five hundred twenty-one thousand, three hundred seventy-seven".