721319041 has 4 divisors (see below), whose sum is σ = 721382400. Its totient is φ = 721255684.

The previous prime is 721319017. The next prime is 721319047. The reversal of 721319041 is 140913127.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 140913127 = 67 ⋅2103181.

It is a cyclic number.

It is not a de Polignac number, because 721319041 - 2⁵ = 721319009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721319047) 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, 9361 + ... + 39118.

It is an arithmetic number, because the mean of its divisors is an integer number (180345600).

Almost surely, 2^721319041 is an apocalyptic number.

It is an amenable number.

721319041 is a deficient number, since it is larger than the sum of its proper divisors (63359).

721319041 is a wasteful number, since it uses less digits than its factorization.

721319041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63358.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 721319041 is about 26857.3833610052. The cubic root of 721319041 is about 896.8279447298.

The spelling of 721319041 in words is "seven hundred twenty-one million, three hundred nineteen thousand, forty-one".