721124033 has 6 divisors (see below), whose sum is σ = 838858626. Its totient is φ = 618106272.

The previous prime is 721124029. The next prime is 721124051. The reversal of 721124033 is 330421127.

It can be written as a sum of positive squares in only one way, i.e., 701614144 + 19509889 = 26488^2 + 4417^2 .

It is not a de Polignac number, because 721124033 - 2² = 721124029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721124533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7358360 + ... + 7358457.

It is an arithmetic number, because the mean of its divisors is an integer number (139809771).

Almost surely, 2^721124033 is an apocalyptic number.

It is an amenable number.

721124033 is a deficient number, since it is larger than the sum of its proper divisors (117734593).

721124033 is a wasteful number, since it uses less digits than its factorization.

721124033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14716831 (or 14716824 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 721124033 is about 26853.7526800259. The cubic root of 721124033 is about 896.7471185505.

The spelling of 721124033 in words is "seven hundred twenty-one million, one hundred twenty-four thousand, thirty-three".