31143201331 has 4 divisors (see below), whose sum is σ = 33974401464. Its totient is φ = 28312001200.

The previous prime is 31143201317. The next prime is 31143201361. The reversal of 31143201331 is 13310234113.

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 31143201331 - 2⁷ = 31143201203 is a prime.

It is a super-2 number, since 2×31143201331² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143201311) 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, 1415600050 + ... + 1415600071.

It is an arithmetic number, because the mean of its divisors is an integer number (8493600366).

Almost surely, 2^31143201331 is an apocalyptic number.

31143201331 is a deficient number, since it is larger than the sum of its proper divisors (2831200133).

31143201331 is a wasteful number, since it uses less digits than its factorization.

31143201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831200132.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31143201331 its reverse (13310234113), we get a palindrome (44453435444).

The spelling of 31143201331 in words is "thirty-one billion, one hundred forty-three million, two hundred one thousand, three hundred thirty-one".