521430361 has 4 divisors (see below), whose sum is σ = 532524672. Its totient is φ = 510336052.

The previous prime is 521430293. The next prime is 521430373. The reversal of 521430361 is 163034125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521430361 - 2¹⁵ = 521397593 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521430391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5547085 + ... + 5547178.

It is an arithmetic number, because the mean of its divisors is an integer number (133131168).

Almost surely, 2^521430361 is an apocalyptic number.

It is an amenable number.

521430361 is a deficient number, since it is larger than the sum of its proper divisors (11094311).

521430361 is a wasteful number, since it uses less digits than its factorization.

521430361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11094310.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 521430361 is about 22834.8497039065. The cubic root of 521430361 is about 804.8817958457.

Adding to 521430361 its reverse (163034125), we get a palindrome (684464486).

The spelling of 521430361 in words is "five hundred twenty-one million, four hundred thirty thousand, three hundred sixty-one".