721341053 has 4 divisors (see below), whose sum is σ = 725935740. Its totient is φ = 716746368.

The previous prime is 721341029. The next prime is 721341073. The reversal of 721341053 is 350143127.

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 107391769 + 613949284 = 10363^2 + 24778^2 .

It is a cyclic number.

It is not a de Polignac number, because 721341053 - 2⁸ = 721340797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721341073) 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, 2297108 + ... + 2297421.

It is an arithmetic number, because the mean of its divisors is an integer number (181483935).

Almost surely, 2^721341053 is an apocalyptic number.

It is an amenable number.

721341053 is a deficient number, since it is larger than the sum of its proper divisors (4594687).

721341053 is a wasteful number, since it uses less digits than its factorization.

721341053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594686.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 721341053 is about 26857.7931520816. The cubic root of 721341053 is about 896.8370672654.

The spelling of 721341053 in words is "seven hundred twenty-one million, three hundred forty-one thousand, fifty-three".