721914829 has 2 divisors, whose sum is σ = 721914830. Its totient is φ = 721914828.

The previous prime is 721914821. The next prime is 721914833. The reversal of 721914829 is 928419127.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653058025 + 68856804 = 25555^2 + 8298^2 .

It is a cyclic number.

It is not a de Polignac number, because 721914829 - 2³ = 721914821 is a prime.

It is a super-2 number, since 2×721914829² = 1042322040660198482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721914821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360957414 + 360957415.

It is an arithmetic number, because the mean of its divisors is an integer number (360957415).

Almost surely, 2^721914829 is an apocalyptic number.

It is an amenable number.

721914829 is a deficient number, since it is larger than the sum of its proper divisors (1).

721914829 is an equidigital number, since it uses as much as digits as its factorization.

721914829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 721914829 is about 26868.4727701446. The cubic root of 721914829 is about 897.0747944843.

The spelling of 721914829 in words is "seven hundred twenty-one million, nine hundred fourteen thousand, eight hundred twenty-nine".