31404143 has 4 divisors (see below), whose sum is σ = 31996728. Its totient is φ = 30811560.

The previous prime is 31404137. The next prime is 31404161. The reversal of 31404143 is 34140413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34140413 = 41 ⋅832693.

It is a cyclic number.

It is not a de Polignac number, because 31404143 - 2⁴ = 31404127 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 (31400143) 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, 296213 + ... + 296318.

It is an arithmetic number, because the mean of its divisors is an integer number (7999182).

Almost surely, 2^31404143 is an apocalyptic number.

31404143 is a deficient number, since it is larger than the sum of its proper divisors (592585).

31404143 is an equidigital number, since it uses as much as digits as its factorization.

31404143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592584.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 31404143 is about 5603.9399532829. The cubic root of 31404143 is about 315.4973013198.

Adding to 31404143 its reverse (34140413), we get a palindrome (65544556).

The spelling of 31404143 in words is "thirty-one million, four hundred four thousand, one hundred forty-three".