109278691 has 2 divisors, whose sum is σ = 109278692. Its totient is φ = 109278690.

The previous prime is 109278647. The next prime is 109278707. The reversal of 109278691 is 196872901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109278691 - 2¹⁵ = 109245923 is a prime.

It is not a weakly prime, because it can be changed into another prime (109278791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54639345 + 54639346.

It is an arithmetic number, because the mean of its divisors is an integer number (54639346).

Almost surely, 2^109278691 is an apocalyptic number.

109278691 is a deficient number, since it is larger than the sum of its proper divisors (1).

109278691 is an equidigital number, since it uses as much as digits as its factorization.

109278691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 109278691 is about 10453.6448667438. The cubic root of 109278691 is about 478.0923868623.

The spelling of 109278691 in words is "one hundred nine million, two hundred seventy-eight thousand, six hundred ninety-one".