203400031431 has 4 divisors (see below), whose sum is σ = 271200041912. Its totient is φ = 135600020952.

The previous prime is 203400031361. The next prime is 203400031451. The reversal of 203400031431 is 134130004302.

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

It is not a de Polignac number, because 203400031431 - 2²⁷ = 203265813703 is a prime.

It is a super-2 number, since 2×203400031431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203400031398 and 203400031407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203400031451) 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, 33900005236 + ... + 33900005241.

It is an arithmetic number, because the mean of its divisors is an integer number (67800010478).

Almost surely, 2^203400031431 is an apocalyptic number.

203400031431 is a deficient number, since it is larger than the sum of its proper divisors (67800010481).

203400031431 is an equidigital number, since it uses as much as digits as its factorization.

203400031431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67800010480.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 203400031431 its reverse (134130004302), we get a palindrome (337530035733).

The spelling of 203400031431 in words is "two hundred three billion, four hundred million, thirty-one thousand, four hundred thirty-one".