31132643 has 2 divisors, whose sum is σ = 31132644. Its totient is φ = 31132642.

The previous prime is 31132601. The next prime is 31132657. The reversal of 31132643 is 34623113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31132643 is a prime.

It is not a weakly prime, because it can be changed into another prime (31134643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566321 + 15566322.

It is an arithmetic number, because the mean of its divisors is an integer number (15566322).

Almost surely, 2^31132643 is an apocalyptic number.

31132643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132643 is an equidigital number, since it uses as much as digits as its factorization.

31132643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 31132643 is about 5579.6633410986. The cubic root of 31132643 is about 314.5854730475.

Adding to 31132643 its reverse (34623113), we get a palindrome (65755756).

The spelling of 31132643 in words is "thirty-one million, one hundred thirty-two thousand, six hundred forty-three".