721304051 has 8 divisors (see below), whose sum is σ = 780858624. Its totient is φ = 662330880.

The previous prime is 721304047. The next prime is 721304053. The reversal of 721304051 is 150403127.

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 721304051 - 2² = 721304047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721304053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142766 + ... + 147731.

It is an arithmetic number, because the mean of its divisors is an integer number (97607328).

Almost surely, 2^721304051 is an apocalyptic number.

721304051 is a deficient number, since it is larger than the sum of its proper divisors (59554573).

721304051 is a wasteful number, since it uses less digits than its factorization.

721304051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290701.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 721304051 is about 26857.1042929054. The cubic root of 721304051 is about 896.8217322481.

Adding to 721304051 its reverse (150403127), we get a palindrome (871707178).

The spelling of 721304051 in words is "seven hundred twenty-one million, three hundred four thousand, fifty-one".