981777229 has 2 divisors, whose sum is σ = 981777230. Its totient is φ = 981777228.

The previous prime is 981777191. The next prime is 981777257. The reversal of 981777229 is 922777189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768675625 + 213101604 = 27725^2 + 14598^2 .

It is a cyclic number.

It is not a de Polignac number, because 981777229 - 2¹¹ = 981775181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981777259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490888614 + 490888615.

It is an arithmetic number, because the mean of its divisors is an integer number (490888615).

Almost surely, 2^981777229 is an apocalyptic number.

It is an amenable number.

981777229 is a deficient number, since it is larger than the sum of its proper divisors (1).

981777229 is an equidigital number, since it uses as much as digits as its factorization.

981777229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 981777229 is about 31333.3245762399. The cubic root of 981777229 is about 993.8884682702. Note that the first 3 decimals are identical.

The spelling of 981777229 in words is "nine hundred eighty-one million, seven hundred seventy-seven thousand, two hundred twenty-nine".