103111431 has 4 divisors (see below), whose sum is σ = 137481912. Its totient is φ = 68740952.

The previous prime is 103111429. The next prime is 103111439. The reversal of 103111431 is 134111301.

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

It is a cyclic number.

It is not a de Polignac number, because 103111431 - 2¹ = 103111429 is a prime.

It is a super-2 number, since 2×103111431² = 21263934405735522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 103111431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103111439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17185236 + ... + 17185241.

It is an arithmetic number, because the mean of its divisors is an integer number (34370478).

Almost surely, 2^103111431 is an apocalyptic number.

103111431 is a deficient number, since it is larger than the sum of its proper divisors (34370481).

103111431 is an equidigital number, since it uses as much as digits as its factorization.

103111431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34370480.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 103111431 is about 10154.3798924405. The cubic root of 103111431 is about 468.9237953240.

Adding to 103111431 its reverse (134111301), we get a palindrome (237222732).

The spelling of 103111431 in words is "one hundred three million, one hundred eleven thousand, four hundred thirty-one".