721067243 has 4 divisors (see below), whose sum is σ = 776533968. Its totient is φ = 665600520.

The previous prime is 721067239. The next prime is 721067293. The reversal of 721067243 is 342760127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342760127 = 3863 ⋅88729.

It is not a de Polignac number, because 721067243 - 2² = 721067239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721067203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27733343 + ... + 27733368.

It is an arithmetic number, because the mean of its divisors is an integer number (194133492).

Almost surely, 2^721067243 is an apocalyptic number.

721067243 is a deficient number, since it is larger than the sum of its proper divisors (55466725).

721067243 is a wasteful number, since it uses less digits than its factorization.

721067243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55466724.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 721067243 is about 26852.6952650940. The cubic root of 721067243 is about 896.7235777062.

The spelling of 721067243 in words is "seven hundred twenty-one million, sixty-seven thousand, two hundred forty-three".