521379399 has 8 divisors (see below), whose sum is σ = 731760640. Its totient is φ = 329292216.

The previous prime is 521379377. The next prime is 521379503. The reversal of 521379399 is 993973125.

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

It is not a de Polignac number, because 521379399 - 2²³ = 512990791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521379349) 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 7 ways as a sum of consecutive naturals, for example, 4573447 + ... + 4573560.

It is an arithmetic number, because the mean of its divisors is an integer number (91470080).

Almost surely, 2^521379399 is an apocalyptic number.

521379399 is a deficient number, since it is larger than the sum of its proper divisors (210381241).

521379399 is a wasteful number, since it uses less digits than its factorization.

521379399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147029.

The product of its digits is 459270, while the sum is 48.

The square root of 521379399 is about 22833.7337945418. The cubic root of 521379399 is about 804.8555732821.

The spelling of 521379399 in words is "five hundred twenty-one million, three hundred seventy-nine thousand, three hundred ninety-nine".