721241651 has 8 divisors (see below), whose sum is σ = 777114240. Its totient is φ = 665425152.

The previous prime is 721241627. The next prime is 721241681. The reversal of 721241651 is 156142127.

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

It is a cyclic number.

It is not a de Polignac number, because 721241651 - 2¹⁸ = 720979507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721241621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14915 + ... + 40803.

It is an arithmetic number, because the mean of its divisors is an integer number (97139280).

Almost surely, 2^721241651 is an apocalyptic number.

721241651 is a deficient number, since it is larger than the sum of its proper divisors (55872589).

721241651 is a wasteful number, since it uses less digits than its factorization.

721241651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28045.

The product of its digits is 3360, while the sum is 29.

The square root of 721241651 is about 26855.9425639839. The cubic root of 721241651 is about 896.7958701586.

Adding to 721241651 its reverse (156142127), we get a palindrome (877383778).

The spelling of 721241651 in words is "seven hundred twenty-one million, two hundred forty-one thousand, six hundred fifty-one".