2101949659 has 2 divisors, whose sum is σ = 2101949660. Its totient is φ = 2101949658.

The previous prime is 2101949657. The next prime is 2101949677. The reversal of 2101949659 is 9569491012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101949659 - 2¹ = 2101949657 is a prime.

Together with 2101949657, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2101949657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050974829 + 1050974830.

It is an arithmetic number, because the mean of its divisors is an integer number (1050974830).

Almost surely, 2^2101949659 is an apocalyptic number.

2101949659 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101949659 is an equidigital number, since it uses as much as digits as its factorization.

2101949659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 2101949659 is about 45847.0245381312. The cubic root of 2101949659 is about 1280.9753428354.

The spelling of 2101949659 in words is "two billion, one hundred one million, nine hundred forty-nine thousand, six hundred fifty-nine".