721427471 has 4 divisors (see below), whose sum is σ = 723226944. Its totient is φ = 719628000.

The previous prime is 721427429. The next prime is 721427477. The reversal of 721427471 is 174724127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 174724127 = 2887 ⋅60521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721427471 is a prime.

It is a super-3 number, since 3×721427471³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721427477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899135 + ... + 899936.

It is an arithmetic number, because the mean of its divisors is an integer number (180806736).

Almost surely, 2^721427471 is an apocalyptic number.

721427471 is a deficient number, since it is larger than the sum of its proper divisors (1799473).

721427471 is a wasteful number, since it uses less digits than its factorization.

721427471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799472.

The product of its digits is 21952, while the sum is 35.

The square root of 721427471 is about 26859.4019106904. The cubic root of 721427471 is about 896.8728800850.

The spelling of 721427471 in words is "seven hundred twenty-one million, four hundred twenty-seven thousand, four hundred seventy-one".