612564521 has 4 divisors (see below), whose sum is σ = 616971600. Its totient is φ = 608157444.

The previous prime is 612564493. The next prime is 612564529. The reversal of 612564521 is 125465216.

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.

It is a cyclic number.

It is not a de Polignac number, because 612564521 - 2⁶ = 612564457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612564529) 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, 2203331 + ... + 2203608.

It is an arithmetic number, because the mean of its divisors is an integer number (154242900).

Almost surely, 2^612564521 is an apocalyptic number.

It is an amenable number.

612564521 is a deficient number, since it is larger than the sum of its proper divisors (4407079).

612564521 is a wasteful number, since it uses less digits than its factorization.

612564521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407078.

The product of its digits is 14400, while the sum is 32.

The square root of 612564521 is about 24750.0408282492. The cubic root of 612564521 is about 849.2794451746.

The spelling of 612564521 in words is "six hundred twelve million, five hundred sixty-four thousand, five hundred twenty-one".