2177961091 has 2 divisors, whose sum is σ = 2177961092. Its totient is φ = 2177961090.

The previous prime is 2177961077. The next prime is 2177961113. The reversal of 2177961091 is 1901697712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2177961091 - 2²⁷ = 2043743363 is a prime.

It is not a weakly prime, because it can be changed into another prime (2177961791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088980545 + 1088980546.

It is an arithmetic number, because the mean of its divisors is an integer number (1088980546).

Almost surely, 2^2177961091 is an apocalyptic number.

2177961091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177961091 is an equidigital number, since it uses as much as digits as its factorization.

2177961091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 43.

The square root of 2177961091 is about 46668.6306955754. The cubic root of 2177961091 is about 1296.2338912176.

The spelling of 2177961091 in words is "two billion, one hundred seventy-seven million, nine hundred sixty-one thousand, ninety-one".