521172049 has 4 divisors (see below), whose sum is σ = 532260864. Its totient is φ = 510083236.

The previous prime is 521172037. The next prime is 521172053. The reversal of 521172049 is 940271125.

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 521172049 - 2⁷ = 521171921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521172049.

It is not an unprimeable number, because it can be changed into a prime (521173049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5544337 + ... + 5544430.

It is an arithmetic number, because the mean of its divisors is an integer number (133065216).

Almost surely, 2^521172049 is an apocalyptic number.

It is an amenable number.

521172049 is a deficient number, since it is larger than the sum of its proper divisors (11088815).

521172049 is a wasteful number, since it uses less digits than its factorization.

521172049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088814.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 521172049 is about 22829.1929117085. The cubic root of 521172049 is about 804.7488634455.

The spelling of 521172049 in words is "five hundred twenty-one million, one hundred seventy-two thousand, forty-nine".