721877141 has 4 divisors (see below), whose sum is σ = 741387372. Its totient is φ = 702366912.

The previous prime is 721877087. The next prime is 721877153. The reversal of 721877141 is 141778127.

721877141 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 286320241 + 435556900 = 16921^2 + 20870^2 .

It is a cyclic number.

It is not a de Polignac number, because 721877141 - 2¹⁴ = 721860757 is a prime.

It is a super-2 number, since 2×721877141² = 1042213213396667762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721877095 and 721877104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721877041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9755060 + ... + 9755133.

It is an arithmetic number, because the mean of its divisors is an integer number (185346843).

Almost surely, 2^721877141 is an apocalyptic number.

It is an amenable number.

721877141 is a deficient number, since it is larger than the sum of its proper divisors (19510231).

721877141 is a wasteful number, since it uses less digits than its factorization.

721877141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19510230.

The product of its digits is 21952, while the sum is 38.

The square root of 721877141 is about 26867.7714185602. The cubic root of 721877141 is about 897.0591834353.

The spelling of 721877141 in words is "seven hundred twenty-one million, eight hundred seventy-seven thousand, one hundred forty-one".