203401689 has 4 divisors (see below), whose sum is σ = 271202256. Its totient is φ = 135601124.

The previous prime is 203401661. The next prime is 203401711. The reversal of 203401689 is 986104302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203401689 - 2⁵ = 203401657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203401609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33900279 + ... + 33900284.

It is an arithmetic number, because the mean of its divisors is an integer number (67800564).

Almost surely, 2^203401689 is an apocalyptic number.

It is an amenable number.

203401689 is a deficient number, since it is larger than the sum of its proper divisors (67800567).

203401689 is an equidigital number, since it uses as much as digits as its factorization.

203401689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67800566.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 203401689 is about 14261.8964026528. The cubic root of 203401689 is about 588.1004589106.

The spelling of 203401689 in words is "two hundred three million, four hundred one thousand, six hundred eighty-nine".