721745341 has 4 divisors (see below), whose sum is σ = 730441152. Its totient is φ = 713049532.

The previous prime is 721745329. The next prime is 721745389. The reversal of 721745341 is 143547127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 143547127 = 73 ⋅1966399.

It is a cyclic number.

It is not a de Polignac number, because 721745341 - 2¹⁷ = 721614269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721745297 and 721745306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721745041) 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, 4347781 + ... + 4347946.

It is an arithmetic number, because the mean of its divisors is an integer number (182610288).

Almost surely, 2^721745341 is an apocalyptic number.

It is an amenable number.

721745341 is a deficient number, since it is larger than the sum of its proper divisors (8695811).

721745341 is an equidigital number, since it uses as much as digits as its factorization.

721745341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8695810.

The product of its digits is 23520, while the sum is 34.

The square root of 721745341 is about 26865.3185538530. The cubic root of 721745341 is about 897.0045852265.

The spelling of 721745341 in words is "seven hundred twenty-one million, seven hundred forty-five thousand, three hundred forty-one".