620180081 has 2 divisors, whose sum is σ = 620180082. Its totient is φ = 620180080.

The previous prime is 620180023. The next prime is 620180131. The reversal of 620180081 is 180081026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451180081 + 169000000 = 21241^2 + 13000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620180081 is a prime.

It is a super-2 number, since 2×620180081² = 769246665738333122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 620180081.

It is not a weakly prime, because it can be changed into another prime (620180021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310090040 + 310090041.

It is an arithmetic number, because the mean of its divisors is an integer number (310090041).

Almost surely, 2^620180081 is an apocalyptic number.

It is an amenable number.

620180081 is a deficient number, since it is larger than the sum of its proper divisors (1).

620180081 is an equidigital number, since it uses as much as digits as its factorization.

620180081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 620180081 is about 24903.4150469368. The cubic root of 620180081 is about 852.7844470088.

The spelling of 620180081 in words is "six hundred twenty million, one hundred eighty thousand, eighty-one".