721475671 has 4 divisors (see below), whose sum is σ = 824543632. Its totient is φ = 618407712.

The previous prime is 721475669. The next prime is 721475683. The reversal of 721475671 is 176574127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176574127 = 29 ⋅6088763.

It is a cyclic number.

It is not a de Polignac number, because 721475671 - 2¹ = 721475669 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 (721475071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51533970 + ... + 51533983.

It is an arithmetic number, because the mean of its divisors is an integer number (206135908).

Almost surely, 2^721475671 is an apocalyptic number.

721475671 is a deficient number, since it is larger than the sum of its proper divisors (103067961).

721475671 is a wasteful number, since it uses less digits than its factorization.

721475671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103067960.

The product of its digits is 82320, while the sum is 40.

The square root of 721475671 is about 26860.2991606572. The cubic root of 721475671 is about 896.8928535921.

The spelling of 721475671 in words is "seven hundred twenty-one million, four hundred seventy-five thousand, six hundred seventy-one".