31368143 has 4 divisors (see below), whose sum is σ = 31430280. Its totient is φ = 31306008.

The previous prime is 31368137. The next prime is 31368149. The reversal of 31368143 is 34186313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34186313 = 7 ⋅4883759.

It is an interprime number because it is at equal distance from previous prime (31368137) and next prime (31368149).

It is a cyclic number.

It is not a de Polignac number, because 31368143 - 2⁶ = 31368079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31368149) 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, 30305 + ... + 31322.

It is an arithmetic number, because the mean of its divisors is an integer number (7857570).

Almost surely, 2^31368143 is an apocalyptic number.

31368143 is a deficient number, since it is larger than the sum of its proper divisors (62137).

31368143 is an equidigital number, since it uses as much as digits as its factorization.

31368143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62136.

The product of its digits is 5184, while the sum is 29.

The square root of 31368143 is about 5600.7270063805. The cubic root of 31368143 is about 315.3766989135.

The spelling of 31368143 in words is "thirty-one million, three hundred sixty-eight thousand, one hundred forty-three".