721707053 has 4 divisors (see below), whose sum is σ = 721771968. Its totient is φ = 721642140.

The previous prime is 721707037. The next prime is 721707059. The reversal of 721707053 is 350707127.

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.

It is a cyclic number.

It is not a de Polignac number, because 721707053 - 2⁴ = 721707037 is a prime.

It is a super-2 number, since 2×721707053² = 1041722140699889618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721707059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11093 + ... + 39578.

It is an arithmetic number, because the mean of its divisors is an integer number (180442992).

Almost surely, 2^721707053 is an apocalyptic number.

It is an amenable number.

721707053 is a deficient number, since it is larger than the sum of its proper divisors (64915).

721707053 is a wasteful number, since it uses less digits than its factorization.

721707053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64914.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 721707053 is about 26864.6059528146. The cubic root of 721707053 is about 896.9887231594.

The spelling of 721707053 in words is "seven hundred twenty-one million, seven hundred seven thousand, fifty-three".