31231140143 has 24 divisors (see below), whose sum is σ = 38005297200. Its totient is φ = 25555947648.

The previous prime is 31231140139. The next prime is 31231140191. The reversal of 31231140143 is 34104113213.

It is not a de Polignac number, because 31231140143 - 2² = 31231140139 is a prime.

It is a super-2 number, since 2×31231140143² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231140943) 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 23 ways as a sum of consecutive naturals, for example, 2996 + ... + 249942.

It is an arithmetic number, because the mean of its divisors is an integer number (1583554050).

Almost surely, 2^31231140143 is an apocalyptic number.

31231140143 is a deficient number, since it is larger than the sum of its proper divisors (6774157057).

31231140143 is a wasteful number, since it uses less digits than its factorization.

31231140143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247079 (or 247072 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31231140143 its reverse (34104113213), we get a palindrome (65335253356).

The spelling of 31231140143 in words is "thirty-one billion, two hundred thirty-one million, one hundred forty thousand, one hundred forty-three".