721949269 has 2 divisors, whose sum is σ = 721949270. Its totient is φ = 721949268.

The previous prime is 721949233. The next prime is 721949299. The reversal of 721949269 is 962949127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471107025 + 250842244 = 21705^2 + 15838^2 .

It is a cyclic number.

It is not a de Polignac number, because 721949269 - 2¹⁵ = 721916501 is a prime.

It is a super-2 number, since 2×721949269² = 1042421494019268722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721949219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360974634 + 360974635.

It is an arithmetic number, because the mean of its divisors is an integer number (360974635).

Almost surely, 2^721949269 is an apocalyptic number.

It is an amenable number.

721949269 is a deficient number, since it is larger than the sum of its proper divisors (1).

721949269 is an equidigital number, since it uses as much as digits as its factorization.

721949269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 721949269 is about 26869.1136623447. The cubic root of 721949269 is about 897.0890596780.

The spelling of 721949269 in words is "seven hundred twenty-one million, nine hundred forty-nine thousand, two hundred sixty-nine".