620622181 has 2 divisors, whose sum is σ = 620622182. Its totient is φ = 620622180.

The previous prime is 620622161. The next prime is 620622217. The reversal of 620622181 is 181226026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515744100 + 104878081 = 22710^2 + 10241^2 .

It is a cyclic number.

It is not a de Polignac number, because 620622181 - 2²⁷ = 486404453 is a prime.

It is a super-2 number, since 2×620622181² = 770343783098393522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620622131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310311090 + 310311091.

It is an arithmetic number, because the mean of its divisors is an integer number (310311091).

Almost surely, 2^620622181 is an apocalyptic number.

It is an amenable number.

620622181 is a deficient number, since it is larger than the sum of its proper divisors (1).

620622181 is an equidigital number, since it uses as much as digits as its factorization.

620622181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 620622181 is about 24912.2897582699. The cubic root of 620622181 is about 852.9870367968.

The spelling of 620622181 in words is "six hundred twenty million, six hundred twenty-two thousand, one hundred eighty-one".