620649149 has 2 divisors, whose sum is σ = 620649150. Its totient is φ = 620649148.

The previous prime is 620649119. The next prime is 620649151. The reversal of 620649149 is 941946026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487084900 + 133564249 = 22070^2 + 11557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620649149 is a prime.

Together with 620649151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620649119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310324574 + 310324575.

It is an arithmetic number, because the mean of its divisors is an integer number (310324575).

Almost surely, 2^620649149 is an apocalyptic number.

It is an amenable number.

620649149 is a deficient number, since it is larger than the sum of its proper divisors (1).

620649149 is an equidigital number, since it uses as much as digits as its factorization.

620649149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 620649149 is about 24912.8310113483. The cubic root of 620649149 is about 852.9993916142. Note that the first 3 decimals are identical.

It can be divided in two parts, 6206 and 49149, that added together give a palindrome (55355).

The spelling of 620649149 in words is "six hundred twenty million, six hundred forty-nine thousand, one hundred forty-nine".