981812729 has 2 divisors, whose sum is σ = 981812730. Its totient is φ = 981812728.

The previous prime is 981812693. The next prime is 981812791. The reversal of 981812729 is 927218189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819505129 + 162307600 = 28627^2 + 12740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981812729 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (981811729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490906364 + 490906365.

It is an arithmetic number, because the mean of its divisors is an integer number (490906365).

Almost surely, 2^981812729 is an apocalyptic number.

It is an amenable number.

981812729 is a deficient number, since it is larger than the sum of its proper divisors (1).

981812729 is an equidigital number, since it uses as much as digits as its factorization.

981812729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 981812729 is about 31333.8910606391. The cubic root of 981812729 is about 993.9004474355.

The spelling of 981812729 in words is "nine hundred eighty-one million, eight hundred twelve thousand, seven hundred twenty-nine".