622687381 has 2 divisors, whose sum is σ = 622687382. Its totient is φ = 622687380.

The previous prime is 622687379. The next prime is 622687423. The reversal of 622687381 is 183786226.

622687381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621754225 + 933156 = 24935^2 + 966^2 .

It is a cyclic number.

It is not a de Polignac number, because 622687381 - 2¹ = 622687379 is a prime.

It is a super-2 number, since 2×622687381² = 775479148913278322, which contains 22 as substring.

Together with 622687379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622687081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311343690 + 311343691.

It is an arithmetic number, because the mean of its divisors is an integer number (311343691).

Almost surely, 2^622687381 is an apocalyptic number.

It is an amenable number.

622687381 is a deficient number, since it is larger than the sum of its proper divisors (1).

622687381 is an equidigital number, since it uses as much as digits as its factorization.

622687381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 622687381 is about 24953.7047550058. The cubic root of 622687381 is about 853.9321305621.

The spelling of 622687381 in words is "six hundred twenty-two million, six hundred eighty-seven thousand, three hundred eighty-one".