721161055 has 8 divisors (see below), whose sum is σ = 910940400. Its totient is φ = 546564096.

The previous prime is 721161047. The next prime is 721161073. The reversal of 721161055 is 550161127.

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 721161055 - 2³ = 721161047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3795490 + ... + 3795679.

It is an arithmetic number, because the mean of its divisors is an integer number (113867550).

Almost surely, 2^721161055 is an apocalyptic number.

721161055 is a deficient number, since it is larger than the sum of its proper divisors (189779345).

721161055 is a wasteful number, since it uses less digits than its factorization.

721161055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7591193.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 721161055 is about 26854.4419975541. The cubic root of 721161055 is about 896.7624644097.

The spelling of 721161055 in words is "seven hundred twenty-one million, one hundred sixty-one thousand, fifty-five".