2091440971 has 2 divisors, whose sum is σ = 2091440972. Its totient is φ = 2091440970.

The previous prime is 2091440969. The next prime is 2091440987. The reversal of 2091440971 is 1790441902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091440971 - 2¹ = 2091440969 is a prime.

Together with 2091440969, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2091440971.

It is not a weakly prime, because it can be changed into another prime (2091440471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045720485 + 1045720486.

It is an arithmetic number, because the mean of its divisors is an integer number (1045720486).

Almost surely, 2^2091440971 is an apocalyptic number.

2091440971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091440971 is an equidigital number, since it uses as much as digits as its factorization.

2091440971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 2091440971 is about 45732.2749379473. The cubic root of 2091440971 is about 1278.8370318588.

The spelling of 2091440971 in words is "two billion, ninety-one million, four hundred forty thousand, nine hundred seventy-one".