521540029 has 2 divisors, whose sum is σ = 521540030. Its totient is φ = 521540028.

The previous prime is 521540023. The next prime is 521540051. The reversal of 521540029 is 920045125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 480924900 + 40615129 = 21930^2 + 6373^2 .

It is a cyclic number.

It is not a de Polignac number, because 521540029 - 2¹⁷ = 521408957 is a prime.

It is a super-3 number, since 3×521540029³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521539979 and 521540006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521540023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260770014 + 260770015.

It is an arithmetic number, because the mean of its divisors is an integer number (260770015).

Almost surely, 2^521540029 is an apocalyptic number.

It is an amenable number.

521540029 is a deficient number, since it is larger than the sum of its proper divisors (1).

521540029 is an equidigital number, since it uses as much as digits as its factorization.

521540029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 521540029 is about 22837.2509072349. The cubic root of 521540029 is about 804.9382198643.

It can be divided in two parts, 52 and 1540029, that added together give a square (1540081 = 1241²).

The spelling of 521540029 in words is "five hundred twenty-one million, five hundred forty thousand, twenty-nine".