721265047 has 4 divisors (see below), whose sum is σ = 721328760. Its totient is φ = 721201336.

The previous prime is 721265011. The next prime is 721265059. The reversal of 721265047 is 740562127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 721265047 - 2¹¹ = 721262999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721260047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9772 + ... + 39217.

It is an arithmetic number, because the mean of its divisors is an integer number (180332190).

Almost surely, 2^721265047 is an apocalyptic number.

721265047 is a deficient number, since it is larger than the sum of its proper divisors (63713).

721265047 is a wasteful number, since it uses less digits than its factorization.

721265047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63712.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 721265047 is about 26856.3781437483. The cubic root of 721265047 is about 896.8055669591.

The spelling of 721265047 in words is "seven hundred twenty-one million, two hundred sixty-five thousand, forty-seven".