507881821 has 2 divisors, whose sum is σ = 507881822. Its totient is φ = 507881820.

The previous prime is 507881819. The next prime is 507881839. The reversal of 507881821 is 128188705.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394459321 + 113422500 = 19861^2 + 10650^2 .

It is a cyclic number.

It is not a de Polignac number, because 507881821 - 2¹ = 507881819 is a prime.

Together with 507881819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (507881861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253940910 + 253940911.

It is an arithmetic number, because the mean of its divisors is an integer number (253940911).

Almost surely, 2^507881821 is an apocalyptic number.

It is an amenable number.

507881821 is a deficient number, since it is larger than the sum of its proper divisors (1).

507881821 is an equidigital number, since it uses as much as digits as its factorization.

507881821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 40.

The square root of 507881821 is about 22536.2335140547. The cubic root of 507881821 is about 797.8493386046.

The spelling of 507881821 in words is "five hundred seven million, eight hundred eighty-one thousand, eight hundred twenty-one".