620456521 has 4 divisors (see below), whose sum is σ = 622331344. Its totient is φ = 618581700.

The previous prime is 620456519. The next prime is 620456539. The reversal of 620456521 is 125654026.

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 620456521 - 2¹ = 620456519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620456581) 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, 936915 + ... + 937576.

It is an arithmetic number, because the mean of its divisors is an integer number (155582836).

Almost surely, 2^620456521 is an apocalyptic number.

It is an amenable number.

620456521 is a deficient number, since it is larger than the sum of its proper divisors (1874823).

620456521 is a wasteful number, since it uses less digits than its factorization.

620456521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874822.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 620456521 is about 24908.9646713789. The cubic root of 620456521 is about 852.9111353270.

The spelling of 620456521 in words is "six hundred twenty million, four hundred fifty-six thousand, five hundred twenty-one".