721133073 has 6 divisors (see below), whose sum is σ = 1041636674. Its totient is φ = 480755376.

The previous prime is 721133069. The next prime is 721133089. The reversal of 721133073 is 370331127.

It can be written as a sum of positive squares in only one way, i.e., 632170449 + 88962624 = 25143^2 + 9432^2 .

It is not a de Polignac number, because 721133073 - 2² = 721133069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721133573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40062940 + ... + 40062957.

Almost surely, 2^721133073 is an apocalyptic number.

It is an amenable number.

721133073 is a deficient number, since it is larger than the sum of its proper divisors (320503601).

721133073 is a wasteful number, since it uses less digits than its factorization.

721133073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80125903 (or 80125900 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 27.

The square root of 721133073 is about 26853.9209986177. The cubic root of 721133073 is about 896.7508657376.

The spelling of 721133073 in words is "seven hundred twenty-one million, one hundred thirty-three thousand, seventy-three".