1620283381 has 2 divisors, whose sum is σ = 1620283382. Its totient is φ = 1620283380.

The previous prime is 1620283367. The next prime is 1620283471. The reversal of 1620283381 is 1833820261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1446280900 + 174002481 = 38030^2 + 13191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620283381 - 2¹⁹ = 1619759093 is a prime.

It is a super-2 number, since 2×1620283381² = 5250636469489582322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620283321) 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, 810141690 + 810141691.

It is an arithmetic number, because the mean of its divisors is an integer number (810141691).

Almost surely, 2^1620283381 is an apocalyptic number.

It is an amenable number.

1620283381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620283381 is an equidigital number, since it uses as much as digits as its factorization.

1620283381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1620283381 is about 40252.7437698351. The cubic root of 1620283381 is about 1174.5287697843.

The spelling of 1620283381 in words is "one billion, six hundred twenty million, two hundred eighty-three thousand, three hundred eighty-one".