621823049 has 2 divisors, whose sum is σ = 621823050. Its totient is φ = 621823048.

The previous prime is 621823039. The next prime is 621823121. The reversal of 621823049 is 940328126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 587189824 + 34633225 = 24232^2 + 5885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621823049 is a prime.

It is not a weakly prime, because it can be changed into another prime (621823039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310911524 + 310911525.

It is an arithmetic number, because the mean of its divisors is an integer number (310911525).

Almost surely, 2^621823049 is an apocalyptic number.

It is an amenable number.

621823049 is a deficient number, since it is larger than the sum of its proper divisors (1).

621823049 is an equidigital number, since it uses as much as digits as its factorization.

621823049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 621823049 is about 24936.3800299883. The cubic root of 621823049 is about 853.5368425174.

The spelling of 621823049 in words is "six hundred twenty-one million, eight hundred twenty-three thousand, forty-nine".