31144643 has 2 divisors, whose sum is σ = 31144644. Its totient is φ = 31144642.

The previous prime is 31144613. The next prime is 31144649. The reversal of 31144643 is 34644113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31144643 - 2⁸ = 31144387 is a prime.

It is not a weakly prime, because it can be changed into another prime (31144649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572321 + 15572322.

It is an arithmetic number, because the mean of its divisors is an integer number (15572322).

Almost surely, 2^31144643 is an apocalyptic number.

31144643 is a deficient number, since it is larger than the sum of its proper divisors (1).

31144643 is an equidigital number, since it uses as much as digits as its factorization.

31144643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 31144643 is about 5580.7385711929. The cubic root of 31144643 is about 314.6258865856.

Adding to 31144643 its reverse (34644113), we get a palindrome (65788756).

The spelling of 31144643 in words is "thirty-one million, one hundred forty-four thousand, six hundred forty-three".