31000144433 has 4 divisors (see below), whose sum is σ = 31017474420. Its totient is φ = 30982814448.

The previous prime is 31000144421. The next prime is 31000144459. The reversal of 31000144433 is 33444100013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21185675809 + 9814468624 = 145553^2 + 99068^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000144433 - 2¹⁰ = 31000143409 is a prime.

It is a super-2 number, since 2×31000144433² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31000144399 and 31000144408.

It is not an unprimeable number, because it can be changed into a prime (31000144493) 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 3 ways as a sum of consecutive naturals, for example, 8662310 + ... + 8665887.

It is an arithmetic number, because the mean of its divisors is an integer number (7754368605).

Almost surely, 2^31000144433 is an apocalyptic number.

It is an amenable number.

31000144433 is a deficient number, since it is larger than the sum of its proper divisors (17329987).

31000144433 is a wasteful number, since it uses less digits than its factorization.

31000144433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17329986.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31000144433 its reverse (33444100013), we get a palindrome (64444244446).

The spelling of 31000144433 in words is "thirty-one billion, one hundred forty-four thousand, four hundred thirty-three".