729313661 has 2 divisors, whose sum is σ = 729313662. Its totient is φ = 729313660.

The previous prime is 729313649. The next prime is 729313681. The reversal of 729313661 is 166313927.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640596100 + 88717561 = 25310^2 + 9419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-729313661 is a prime.

It is a super-2 number, since 2×729313661² = 1063796832242445842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729313631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364656830 + 364656831.

It is an arithmetic number, because the mean of its divisors is an integer number (364656831).

Almost surely, 2^729313661 is an apocalyptic number.

It is an amenable number.

729313661 is a deficient number, since it is larger than the sum of its proper divisors (1).

729313661 is an equidigital number, since it uses as much as digits as its factorization.

729313661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 729313661 is about 27005.8079123732. The cubic root of 729313661 is about 900.1290600927.

The spelling of 729313661 in words is "seven hundred twenty-nine million, three hundred thirteen thousand, six hundred sixty-one".