109278643 has 2 divisors, whose sum is σ = 109278644. Its totient is φ = 109278642.

The previous prime is 109278593. The next prime is 109278647. The reversal of 109278643 is 346872901.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109278643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 109278596 and 109278605.

It is not a weakly prime, because it can be changed into another prime (109278647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54639321 + 54639322.

It is an arithmetic number, because the mean of its divisors is an integer number (54639322).

Almost surely, 2^109278643 is an apocalyptic number.

109278643 is a deficient number, since it is larger than the sum of its proper divisors (1).

109278643 is an equidigital number, since it uses as much as digits as its factorization.

109278643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 109278643 is about 10453.6425708936. The cubic root of 109278643 is about 478.0923168626.

The spelling of 109278643 in words is "one hundred nine million, two hundred seventy-eight thousand, six hundred forty-three".