2091478387 has 2 divisors, whose sum is σ = 2091478388. Its totient is φ = 2091478386.

The previous prime is 2091478379. The next prime is 2091478547. The reversal of 2091478387 is 7838741902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091478387 - 2³ = 2091478379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2091478387.

It is not a weakly prime, because it can be changed into another prime (2091478327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045739193 + 1045739194.

It is an arithmetic number, because the mean of its divisors is an integer number (1045739194).

Almost surely, 2^2091478387 is an apocalyptic number.

2091478387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091478387 is an equidigital number, since it uses as much as digits as its factorization.

2091478387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 2091478387 is about 45732.6840126402. The cubic root of 2091478387 is about 1278.8446579695.

The spelling of 2091478387 in words is "two billion, ninety-one million, four hundred seventy-eight thousand, three hundred eighty-seven".