2091440987 has 2 divisors, whose sum is σ = 2091440988. Its totient is φ = 2091440986.

The previous prime is 2091440971. The next prime is 2091440999. The reversal of 2091440987 is 7890441902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2091440987 - 2⁴ = 2091440971 is a prime.

It is not a weakly prime, because it can be changed into another prime (2091440927) 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, 1045720493 + 1045720494.

It is an arithmetic number, because the mean of its divisors is an integer number (1045720494).

Almost surely, 2^2091440987 is an apocalyptic number.

2091440987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091440987 is an equidigital number, since it uses as much as digits as its factorization.

2091440987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 2091440987 is about 45732.2751128784. The cubic root of 2091440987 is about 1278.8370351200.

The spelling of 2091440987 in words is "two billion, ninety-one million, four hundred forty thousand, nine hundred eighty-seven".