721652033 has 4 divisors (see below), whose sum is σ = 741156180. Its totient is φ = 702147888.

The previous prime is 721652017. The next prime is 721652119. The reversal of 721652033 is 330256127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 591851584 + 129800449 = 24328^2 + 11393^2 .

It is a cyclic number.

It is not a de Polignac number, because 721652033 - 2⁴ = 721652017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 721651987 and 721652005.

It is not an unprimeable number, because it can be changed into a prime (721652003) 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 in 3 ways as a sum of consecutive naturals, for example, 9752018 + ... + 9752091.

It is an arithmetic number, because the mean of its divisors is an integer number (185289045).

Almost surely, 2^721652033 is an apocalyptic number.

It is an amenable number.

721652033 is a deficient number, since it is larger than the sum of its proper divisors (19504147).

721652033 is a wasteful number, since it uses less digits than its factorization.

721652033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19504146.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 721652033 is about 26863.5819093434. The cubic root of 721652033 is about 896.9659283271.

The spelling of 721652033 in words is "seven hundred twenty-one million, six hundred fifty-two thousand, thirty-three".