612053721 has 12 divisors (see below), whose sum is σ = 884393380. Its totient is φ = 407890080.

The previous prime is 612053719. The next prime is 612053731. The reversal of 612053721 is 127350216.

It is a happy number.

612053721 is a `hidden beast` number, since 6 + 120 + 537 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 452157696 + 159896025 = 21264^2 + 12645^2 .

It is not a de Polignac number, because 612053721 - 2¹ = 612053719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612053731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18531 + ... + 39591.

Almost surely, 2^612053721 is an apocalyptic number.

It is an amenable number.

612053721 is a deficient number, since it is larger than the sum of its proper divisors (272339659).

612053721 is a wasteful number, since it uses less digits than its factorization.

612053721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24296 (or 24293 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 612053721 is about 24739.7195012393. The cubic root of 612053721 is about 849.0433162648.

The spelling of 612053721 in words is "six hundred twelve million, fifty-three thousand, seven hundred twenty-one".