521401469 has 8 divisors (see below), whose sum is σ = 552537720. Its totient is φ = 491142400.

The previous prime is 521401457. The next prime is 521401483. The reversal of 521401469 is 964104125.

It can be written as a sum of positive squares in 4 ways, for example, as 100741369 + 420660100 = 10037^2 + 20510^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521401469 - 2¹⁶ = 521335933 is a prime.

It is a super-2 number, since 2×521401469² = 543718983750715922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521401499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218072 + ... + 220449.

It is an arithmetic number, because the mean of its divisors is an integer number (69067215).

Almost surely, 2^521401469 is an apocalyptic number.

It is an amenable number.

521401469 is a deficient number, since it is larger than the sum of its proper divisors (31136251).

521401469 is a wasteful number, since it uses less digits than its factorization.

521401469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438591.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 521401469 is about 22834.2170656232. The cubic root of 521401469 is about 804.8669296391.

The spelling of 521401469 in words is "five hundred twenty-one million, four hundred one thousand, four hundred sixty-nine".