721134355 has 4 divisors (see below), whose sum is σ = 865361232. Its totient is φ = 576907480.

The previous prime is 721134353. The next prime is 721134361. The reversal of 721134355 is 553431127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 553431127 = 31 ⋅17852617.

It is not a de Polignac number, because 721134355 - 2¹ = 721134353 is a prime.

It is a super-2 number, since 2×721134355² = 1040069515922532050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721134353) 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, 72113431 + ... + 72113440.

It is an arithmetic number, because the mean of its divisors is an integer number (216340308).

Almost surely, 2^721134355 is an apocalyptic number.

721134355 is a deficient number, since it is larger than the sum of its proper divisors (144226877).

721134355 is a wasteful number, since it uses less digits than its factorization.

721134355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144226876.

The product of its digits is 12600, while the sum is 31.

The square root of 721134355 is about 26853.9448684919. The cubic root of 721134355 is about 896.7513971393.

The spelling of 721134355 in words is "seven hundred twenty-one million, one hundred thirty-four thousand, three hundred fifty-five".