31190143 has 4 divisors (see below), whose sum is σ = 31296888. Its totient is φ = 31083400.

The previous prime is 31190119. The next prime is 31190161. The reversal of 31190143 is 34109113.

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 31190143 - 2⁵ = 31190111 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 (31199143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52933 + ... + 53518.

It is an arithmetic number, because the mean of its divisors is an integer number (7824222).

Almost surely, 2^31190143 is an apocalyptic number.

31190143 is a deficient number, since it is larger than the sum of its proper divisors (106745).

31190143 is a wasteful number, since it uses less digits than its factorization.

31190143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106744.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31190143 is about 5584.8136047678. The cubic root of 31190143 is about 314.7790270171.

Adding to 31190143 its reverse (34109113), we get a palindrome (65299256).

The spelling of 31190143 in words is "thirty-one million, one hundred ninety thousand, one hundred forty-three".