203142631 has 4 divisors (see below), whose sum is σ = 203185432. Its totient is φ = 203099832.

The previous prime is 203142619. The next prime is 203142637. The reversal of 203142631 is 136241302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136241302 = 2 ⋅68120651.

It is a cyclic number.

It is not a de Polignac number, because 203142631 - 2⁹ = 203142119 is a prime.

It is a super-2 number, since 2×203142631² = 82533857059204322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203142637) 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, 13245 + ... + 24118.

It is an arithmetic number, because the mean of its divisors is an integer number (50796358).

Almost surely, 2^203142631 is an apocalyptic number.

203142631 is a deficient number, since it is larger than the sum of its proper divisors (42801).

203142631 is an equidigital number, since it uses as much as digits as its factorization.

203142631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42800.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 203142631 is about 14252.8113367153. The cubic root of 203142631 is about 587.8506791845.

Adding to 203142631 its reverse (136241302), we get a palindrome (339383933).

The spelling of 203142631 in words is "two hundred three million, one hundred forty-two thousand, six hundred thirty-one".