721297233 has 12 divisors (see below), whose sum is σ = 1103160708. Its totient is φ = 452578560.

The previous prime is 721297223. The next prime is 721297237. The reversal of 721297233 is 332792127.

It can be written as a sum of positive squares in 2 ways, for example, as 577585089 + 143712144 = 24033^2 + 11988^2 .

It is not a de Polignac number, because 721297233 - 2⁵ = 721297201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721297237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2357028 + ... + 2357333.

It is an arithmetic number, because the mean of its divisors is an integer number (91930059).

Almost surely, 2^721297233 is an apocalyptic number.

It is an amenable number.

721297233 is a deficient number, since it is larger than the sum of its proper divisors (381863475).

721297233 is a wasteful number, since it uses less digits than its factorization.

721297233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714384 (or 4714381 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 721297233 is about 26856.9773615722. The cubic root of 721297233 is about 896.8189065559.

The spelling of 721297233 in words is "seven hundred twenty-one million, two hundred ninety-seven thousand, two hundred thirty-three".