981720469 has 2 divisors, whose sum is σ = 981720470. Its totient is φ = 981720468.

The previous prime is 981720461. The next prime is 981720497. The reversal of 981720469 is 964027189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691427025 + 290293444 = 26295^2 + 17038^2 .

It is an emirp because it is prime and its reverse (964027189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981720469 - 2³ = 981720461 is a prime.

It is a super-2 number, since 2×981720469² = 1927550158507159922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981720461) 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, 490860234 + 490860235.

It is an arithmetic number, because the mean of its divisors is an integer number (490860235).

Almost surely, 2^981720469 is an apocalyptic number.

It is an amenable number.

981720469 is a deficient number, since it is larger than the sum of its proper divisors (1).

981720469 is an equidigital number, since it uses as much as digits as its factorization.

981720469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 981720469 is about 31332.4188182145. The cubic root of 981720469 is about 993.8693145032.

The spelling of 981720469 in words is "nine hundred eighty-one million, seven hundred twenty thousand, four hundred sixty-nine".