2078187091 has 2 divisors, whose sum is σ = 2078187092. Its totient is φ = 2078187090.

The previous prime is 2078187053. The next prime is 2078187107. The reversal of 2078187091 is 1907818702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2078187091 - 2⁷ = 2078186963 is a prime.

It is not a weakly prime, because it can be changed into another prime (2078187691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039093545 + 1039093546.

It is an arithmetic number, because the mean of its divisors is an integer number (1039093546).

Almost surely, 2^2078187091 is an apocalyptic number.

2078187091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078187091 is an equidigital number, since it uses as much as digits as its factorization.

2078187091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 2078187091 is about 45587.1373415791. The cubic root of 2078187091 is about 1276.1298898101.

The spelling of 2078187091 in words is "two billion, seventy-eight million, one hundred eighty-seven thousand, ninety-one".