721711053 has 30 divisors (see below), whose sum is σ = 1254136686. Its totient is φ = 412404048.

The previous prime is 721711051. The next prime is 721711079. The reversal of 721711053 is 350117127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 720278244 + 1432809 = 26838^2 + 1197^2 .

It is not a de Polignac number, because 721711053 - 2¹ = 721711051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721711051) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 86950 + ... + 94887.

Almost surely, 2^721711053 is an apocalyptic number.

It is an amenable number.

721711053 is a deficient number, since it is larger than the sum of its proper divisors (532425633).

721711053 is a wasteful number, since it uses less digits than its factorization.

721711053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181863 (or 181847 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 721711053 is about 26864.6804001090. The cubic root of 721711053 is about 896.9903803176.

The spelling of 721711053 in words is "seven hundred twenty-one million, seven hundred eleven thousand, fifty-three".