309204831853 has 2 divisors, whose sum is σ = 309204831854. Its totient is φ = 309204831852.

The previous prime is 309204831847. The next prime is 309204831911. The reversal of 309204831853 is 358138402903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228004340004 + 81200491849 = 477498^2 + 284957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309204831853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309204831833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154602415926 + 154602415927.

It is an arithmetic number, because the mean of its divisors is an integer number (154602415927).

Almost surely, 2^309204831853 is an apocalyptic number.

It is an amenable number.

309204831853 is a deficient number, since it is larger than the sum of its proper divisors (1).

309204831853 is an equidigital number, since it uses as much as digits as its factorization.

309204831853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 309204831853 in words is "three hundred nine billion, two hundred four million, eight hundred thirty-one thousand, eight hundred fifty-three".