201220839877 has 2 divisors, whose sum is σ = 201220839878. Its totient is φ = 201220839876.

The previous prime is 201220839871. The next prime is 201220839901. The reversal of 201220839877 is 778938022102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107908308036 + 93312531841 = 328494^2 + 305471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201220839877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201220839877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220839871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610419938 + 100610419939.

It is an arithmetic number, because the mean of its divisors is an integer number (100610419939).

Almost surely, 2^201220839877 is an apocalyptic number.

It is an amenable number.

201220839877 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220839877 is an equidigital number, since it uses as much as digits as its factorization.

201220839877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 201220839877 in words is "two hundred one billion, two hundred twenty million, eight hundred thirty-nine thousand, eight hundred seventy-seven".