203688091 has 2 divisors, whose sum is σ = 203688092. Its totient is φ = 203688090.

The previous prime is 203688077. The next prime is 203688127. The reversal of 203688091 is 190886302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203688091 - 2⁹ = 203687579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203688091.

It is not a weakly prime, because it can be changed into another prime (203688491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101844045 + 101844046.

It is an arithmetic number, because the mean of its divisors is an integer number (101844046).

Almost surely, 2^203688091 is an apocalyptic number.

203688091 is a deficient number, since it is larger than the sum of its proper divisors (1).

203688091 is an equidigital number, since it uses as much as digits as its factorization.

203688091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 203688091 is about 14271.9336811800. The cubic root of 203688091 is about 588.3763565781.

The spelling of 203688091 in words is "two hundred three million, six hundred eighty-eight thousand, ninety-one".