521397849 has 8 divisors (see below), whose sum is σ = 794511040. Its totient is φ = 297941616.

The previous prime is 521397841. The next prime is 521397853. The reversal of 521397849 is 948793125.

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

It is not a de Polignac number, because 521397849 - 2³ = 521397841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521397798 and 521397807.

It is not an unprimeable number, because it can be changed into a prime (521397841) 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, 12414214 + ... + 12414255.

It is an arithmetic number, because the mean of its divisors is an integer number (99313880).

Almost surely, 2^521397849 is an apocalyptic number.

It is an amenable number.

521397849 is a deficient number, since it is larger than the sum of its proper divisors (273113191).

521397849 is a wasteful number, since it uses less digits than its factorization.

521397849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24828479.

The product of its digits is 544320, while the sum is 48.

The square root of 521397849 is about 22834.1377984806. The cubic root of 521397849 is about 804.8650669510.

The spelling of 521397849 in words is "five hundred twenty-one million, three hundred ninety-seven thousand, eight hundred forty-nine".