506700821 has 4 divisors (see below), whose sum is σ = 552764544. Its totient is φ = 460637100.

The previous prime is 506700773. The next prime is 506700853. The reversal of 506700821 is 128007605.

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 de Polignac number, because none of the positive numbers 2^k-506700821 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 (506700881) 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, 23031845 + ... + 23031866.

It is an arithmetic number, because the mean of its divisors is an integer number (138191136).

Almost surely, 2^506700821 is an apocalyptic number.

It is an amenable number.

506700821 is a deficient number, since it is larger than the sum of its proper divisors (46063723).

506700821 is a wasteful number, since it uses less digits than its factorization.

506700821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46063722.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 506700821 is about 22510.0160150987. The cubic root of 506700821 is about 797.2304338814.

The spelling of 506700821 in words is "five hundred six million, seven hundred thousand, eight hundred twenty-one".