980855261 has 2 divisors, whose sum is σ = 980855262. Its totient is φ = 980855260.

The previous prime is 980855251. The next prime is 980855303. The reversal of 980855261 is 162558089.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588062500 + 392792761 = 24250^2 + 19819^2 .

It is a cyclic number.

It is not a de Polignac number, because 980855261 - 2²⁶ = 913746397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (980855251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490427630 + 490427631.

It is an arithmetic number, because the mean of its divisors is an integer number (490427631).

Almost surely, 2^980855261 is an apocalyptic number.

It is an amenable number.

980855261 is a deficient number, since it is larger than the sum of its proper divisors (1).

980855261 is an equidigital number, since it uses as much as digits as its factorization.

980855261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 980855261 is about 31318.6088611867. The cubic root of 980855261 is about 993.5772570222.

The spelling of 980855261 in words is "nine hundred eighty million, eight hundred fifty-five thousand, two hundred sixty-one".