203981003391 has 16 divisors (see below), whose sum is σ = 299035865088. Its totient is φ = 122651424000.

The previous prime is 203981003383. The next prime is 203981003393. The reversal of 203981003391 is 193300189302.

It is not a de Polignac number, because 203981003391 - 2³ = 203981003383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203981003393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24331410 + ... + 24339791.

It is an arithmetic number, because the mean of its divisors is an integer number (18689741568).

Almost surely, 2^203981003391 is an apocalyptic number.

203981003391 is a deficient number, since it is larger than the sum of its proper divisors (95054861697).

203981003391 is a wasteful number, since it uses less digits than its factorization.

203981003391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48671342.

The product of its (nonzero) digits is 34992, while the sum is 39.

The spelling of 203981003391 in words is "two hundred three billion, nine hundred eighty-one million, three thousand, three hundred ninety-one".