203139861385 has 4 divisors (see below), whose sum is σ = 243767833668. Its totient is φ = 162511889104.

The previous prime is 203139861383. The next prime is 203139861391. The reversal of 203139861385 is 583168931302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583168931302 = 2 ⋅291584465651.

It can be written as a sum of positive squares in 2 ways, for example, as 146368221561 + 56771639824 = 382581^2 + 238268^2 .

It is a cyclic number.

It is not a de Polignac number, because 203139861385 - 2¹ = 203139861383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203139861383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20313986134 + ... + 20313986143.

It is an arithmetic number, because the mean of its divisors is an integer number (60941958417).

Almost surely, 2^203139861385 is an apocalyptic number.

It is an amenable number.

203139861385 is a deficient number, since it is larger than the sum of its proper divisors (40627972283).

203139861385 is an equidigital number, since it uses as much as digits as its factorization.

203139861385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40627972282.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 203139861385 in words is "two hundred three billion, one hundred thirty-nine million, eight hundred sixty-one thousand, three hundred eighty-five".