521540033 has 4 divisors (see below), whose sum is σ = 596045760. Its totient is φ = 447034308.

The previous prime is 521540029. The next prime is 521540051. The reversal of 521540033 is 330045125.

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 not a de Polignac number, because 521540033 - 2² = 521540029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521539990 and 521540008.

It is not an unprimeable number, because it can be changed into a prime (521540003) 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, 37252853 + ... + 37252866.

It is an arithmetic number, because the mean of its divisors is an integer number (149011440).

Almost surely, 2^521540033 is an apocalyptic number.

It is an amenable number.

521540033 is a deficient number, since it is larger than the sum of its proper divisors (74505727).

521540033 is an equidigital number, since it uses as much as digits as its factorization.

521540033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74505726.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 521540033 is about 22837.2509948111. The cubic root of 521540033 is about 804.9382219222.

Adding to 521540033 its reverse (330045125), we get a palindrome (851585158).

The spelling of 521540033 in words is "five hundred twenty-one million, five hundred forty thousand, thirty-three".