31505142343 has 4 divisors (see below), whose sum is σ = 31505625208. Its totient is φ = 31504659480.

The previous prime is 31505142259. The next prime is 31505142379. The reversal of 31505142343 is 34324150513.

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 31505142343 - 2¹³ = 31505134151 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 (31505182343) 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, 124773 + ... + 280318.

It is an arithmetic number, because the mean of its divisors is an integer number (7876406302).

Almost surely, 2^31505142343 is an apocalyptic number.

31505142343 is a deficient number, since it is larger than the sum of its proper divisors (482865).

31505142343 is an equidigital number, since it uses as much as digits as its factorization.

31505142343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482864.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 31505142343 its reverse (34324150513), we get a palindrome (65829292856).

The spelling of 31505142343 in words is "thirty-one billion, five hundred five million, one hundred forty-two thousand, three hundred forty-three".