521420753 has 16 divisors (see below), whose sum is σ = 633024000. Its totient is φ = 419268096.

The previous prime is 521420729. The next prime is 521420771. The reversal of 521420753 is 357024125.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 521420753 - 2¹⁶ = 521355217 is a prime.

It is a super-3 number, since 3×521420753³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (521420153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30248 + ... + 44246.

It is an arithmetic number, because the mean of its divisors is an integer number (39564000).

Almost surely, 2^521420753 is an apocalyptic number.

It is an amenable number.

521420753 is a deficient number, since it is larger than the sum of its proper divisors (111603247).

521420753 is a wasteful number, since it uses less digits than its factorization.

521420753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14336.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 521420753 is about 22834.6393227482. The cubic root of 521420753 is about 804.8768521675.

Adding to 521420753 its reverse (357024125), we get a palindrome (878444878).

The spelling of 521420753 in words is "five hundred twenty-one million, four hundred twenty thousand, seven hundred fifty-three".