620943181 has 2 divisors, whose sum is σ = 620943182. Its totient is φ = 620943180.

The previous prime is 620943151. The next prime is 620943223. The reversal of 620943181 is 181349026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518245225 + 102697956 = 22765^2 + 10134^2 .

It is a cyclic number.

It is not a de Polignac number, because 620943181 - 2⁷ = 620943053 is a prime.

It is a super-2 number, since 2×620943181² = 771140868060797522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620943131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310471590 + 310471591.

It is an arithmetic number, because the mean of its divisors is an integer number (310471591).

Almost surely, 2^620943181 is an apocalyptic number.

It is an amenable number.

620943181 is a deficient number, since it is larger than the sum of its proper divisors (1).

620943181 is an equidigital number, since it uses as much as digits as its factorization.

620943181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 620943181 is about 24918.7315287115. The cubic root of 620943181 is about 853.1340729239.

The spelling of 620943181 in words is "six hundred twenty million, nine hundred forty-three thousand, one hundred eighty-one".