721334631 has 8 divisors (see below), whose sum is σ = 962529664. Its totient is φ = 480514680.

The previous prime is 721334597. The next prime is 721334651. The reversal of 721334631 is 136433127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721334631 - 2¹⁷ = 721203559 is a prime.

It is a super-2 number, since 2×721334631² = 1040647299759812322, which contains 22 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 (721334651) 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 7 ways as a sum of consecutive naturals, for example, 89251 + ... + 96996.

It is an arithmetic number, because the mean of its divisors is an integer number (120316208).

Almost surely, 2^721334631 is an apocalyptic number.

721334631 is a deficient number, since it is larger than the sum of its proper divisors (241195033).

721334631 is a wasteful number, since it uses less digits than its factorization.

721334631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187541.

The product of its digits is 9072, while the sum is 30.

The square root of 721334631 is about 26857.6735961997. The cubic root of 721334631 is about 896.8344057853.

Adding to 721334631 its reverse (136433127), we get a palindrome (857767758).

The spelling of 721334631 in words is "seven hundred twenty-one million, three hundred thirty-four thousand, six hundred thirty-one".