620043551 has 2 divisors, whose sum is σ = 620043552. Its totient is φ = 620043550.

The previous prime is 620043547. The next prime is 620043553. The reversal of 620043551 is 155340026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620043551 - 2² = 620043547 is a prime.

It is a Sophie Germain prime.

Together with 620043553, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620043551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620043553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310021775 + 310021776.

It is an arithmetic number, because the mean of its divisors is an integer number (310021776).

Almost surely, 2^620043551 is an apocalyptic number.

620043551 is a deficient number, since it is larger than the sum of its proper divisors (1).

620043551 is an equidigital number, since it uses as much as digits as its factorization.

620043551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 620043551 is about 24900.6737057454. The cubic root of 620043551 is about 852.7218634630.

Adding to 620043551 its reverse (155340026), we get a palindrome (775383577).

The spelling of 620043551 in words is "six hundred twenty million, forty-three thousand, five hundred fifty-one".