203145431 has 4 divisors (see below), whose sum is σ = 204198192. Its totient is φ = 202092672.

The previous prime is 203145409. The next prime is 203145443. The reversal of 203145431 is 134541302.

203145431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203145431 is a prime.

It is a super-2 number, since 2×203145431² = 82536132272351522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203145397 and 203145406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203145031) 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, 526091 + ... + 526476.

It is an arithmetic number, because the mean of its divisors is an integer number (51049548).

Almost surely, 2^203145431 is an apocalyptic number.

203145431 is a deficient number, since it is larger than the sum of its proper divisors (1052761).

203145431 is a wasteful number, since it uses less digits than its factorization.

203145431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052760.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 203145431 is about 14252.9095626121. The cubic root of 203145431 is about 587.8533800362.

Adding to 203145431 its reverse (134541302), we get a palindrome (337686733).

The spelling of 203145431 in words is "two hundred three million, one hundred forty-five thousand, four hundred thirty-one".