729698381 has 2 divisors, whose sum is σ = 729698382. Its totient is φ = 729698380.

The previous prime is 729698353. The next prime is 729698383. The reversal of 729698381 is 183896927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725817481 + 3880900 = 26941^2 + 1970^2 .

It is an emirp because it is prime and its reverse (183896927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 729698381 - 2¹⁰ = 729697357 is a prime.

It is a super-2 number, since 2×729698381² = 1064919454468042322, which contains 22 as substring.

Together with 729698383, it forms a pair of twin primes.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729698383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364849190 + 364849191.

It is an arithmetic number, because the mean of its divisors is an integer number (364849191).

Almost surely, 2^729698381 is an apocalyptic number.

It is an amenable number.

729698381 is a deficient number, since it is larger than the sum of its proper divisors (1).

729698381 is an equidigital number, since it uses as much as digits as its factorization.

729698381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 729698381 is about 27012.9298855196. The cubic root of 729698381 is about 900.2873078612.

The spelling of 729698381 in words is "seven hundred twenty-nine million, six hundred ninety-eight thousand, three hundred eighty-one".