2101959877 has 2 divisors, whose sum is σ = 2101959878. Its totient is φ = 2101959876.

The previous prime is 2101959869. The next prime is 2101959941. The reversal of 2101959877 is 7789591012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587305281 + 514654596 = 39841^2 + 22686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101959877 - 2³ = 2101959869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101959877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101959077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050979938 + 1050979939.

It is an arithmetic number, because the mean of its divisors is an integer number (1050979939).

Almost surely, 2^2101959877 is an apocalyptic number.

It is an amenable number.

2101959877 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101959877 is an equidigital number, since it uses as much as digits as its factorization.

2101959877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 2101959877 is about 45847.1359737988. The cubic root of 2101959877 is about 1280.9774185250.

The spelling of 2101959877 in words is "two billion, one hundred one million, nine hundred fifty-nine thousand, eight hundred seventy-seven".