721341055 has 4 divisors (see below), whose sum is σ = 865609272. Its totient is φ = 577072840.

The previous prime is 721341029. The next prime is 721341073. The reversal of 721341055 is 550143127.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-721341055 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72134101 + ... + 72134110.

It is an arithmetic number, because the mean of its divisors is an integer number (216402318).

Almost surely, 2^721341055 is an apocalyptic number.

721341055 is a deficient number, since it is larger than the sum of its proper divisors (144268217).

721341055 is a wasteful number, since it uses less digits than its factorization.

721341055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144268216.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 721341055 is about 26857.7931893147. The cubic root of 721341055 is about 896.8370680943.

The spelling of 721341055 in words is "seven hundred twenty-one million, three hundred forty-one thousand, fifty-five".