620505601 has 4 divisors (see below), whose sum is σ = 620678212. Its totient is φ = 620332992.

The previous prime is 620505581. The next prime is 620505649. The reversal of 620505601 is 106505026.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 383376400 + 237129201 = 19580^2 + 15399^2 .

It is a cyclic number.

It is not a de Polignac number, because 620505601 - 2⁹ = 620505089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620505101) 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, 80796 + ... + 88141.

It is an arithmetic number, because the mean of its divisors is an integer number (155169553).

Almost surely, 2^620505601 is an apocalyptic number.

It is an amenable number.

620505601 is a deficient number, since it is larger than the sum of its proper divisors (172611).

620505601 is a wasteful number, since it uses less digits than its factorization.

620505601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172610.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 620505601 is about 24909.9498393714. The cubic root of 620505601 is about 852.9336240233.

The spelling of 620505601 in words is "six hundred twenty million, five hundred five thousand, six hundred one".