31240140223 has 2 divisors, whose sum is σ = 31240140224. Its totient is φ = 31240140222.

The previous prime is 31240140221. The next prime is 31240140247. The reversal of 31240140223 is 32204104213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31240140223 - 2¹ = 31240140221 is a prime.

It is a super-2 number, since 2×31240140223² (a number of 22 digits) contains 22 as substring.

Together with 31240140221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31240140194 and 31240140203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31240140221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620070111 + 15620070112.

It is an arithmetic number, because the mean of its divisors is an integer number (15620070112).

Almost surely, 2^31240140223 is an apocalyptic number.

31240140223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240140223 is an equidigital number, since it uses as much as digits as its factorization.

31240140223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31240140223 its reverse (32204104213), we get a palindrome (63444244436).

The spelling of 31240140223 in words is "thirty-one billion, two hundred forty million, one hundred forty thousand, two hundred twenty-three".