721161127 has 4 divisors (see below), whose sum is σ = 737932360. Its totient is φ = 704389896.

The previous prime is 721161101. The next prime is 721161139.

721161127 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721161127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721161095 and 721161104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721161227) 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 3 ways as a sum of consecutive naturals, for example, 8385552 + ... + 8385637.

It is an arithmetic number, because the mean of its divisors is an integer number (184483090).

Almost surely, 2^721161127 is an apocalyptic number.

721161127 is a deficient number, since it is larger than the sum of its proper divisors (16771233).

721161127 is a wasteful number, since it uses less digits than its factorization.

721161127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16771232.

The product of its digits is 1176, while the sum is 28.

The square root of 721161127 is about 26854.4433381145. The cubic root of 721161127 is about 896.7624942537.

The spelling of 721161127 in words is "seven hundred twenty-one million, one hundred sixty-one thousand, one hundred twenty-seven".