620811061 has 4 divisors (see below), whose sum is σ = 668565772. Its totient is φ = 573056352.

The previous prime is 620811043. The next prime is 620811067. The reversal of 620811061 is 160118026.

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 364619025 + 256192036 = 19095^2 + 16006^2 .

It is a cyclic number.

It is not a de Polignac number, because 620811061 - 2⁷ = 620810933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620811067) 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, 23877336 + ... + 23877361.

It is an arithmetic number, because the mean of its divisors is an integer number (167141443).

Almost surely, 2^620811061 is an apocalyptic number.

It is an amenable number.

620811061 is a deficient number, since it is larger than the sum of its proper divisors (47754711).

620811061 is a wasteful number, since it uses less digits than its factorization.

620811061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47754710.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 620811061 is about 24916.0803699137. The cubic root of 620811061 is about 853.0735606406.

Adding to 620811061 its reverse (160118026), we get a palindrome (780929087).

The spelling of 620811061 in words is "six hundred twenty million, eight hundred eleven thousand, sixty-one".