1609042381 has 2 divisors, whose sum is σ = 1609042382. Its totient is φ = 1609042380.

The previous prime is 1609042363. The next prime is 1609042427. The reversal of 1609042381 is 1832409061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1331520100 + 277522281 = 36490^2 + 16659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1609042381 - 2⁹ = 1609041869 is a prime.

It is a super-2 number, since 2×1609042381² = 5178034767708298322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1609042361) 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, 804521190 + 804521191.

It is an arithmetic number, because the mean of its divisors is an integer number (804521191).

Almost surely, 2^1609042381 is an apocalyptic number.

It is an amenable number.

1609042381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609042381 is an equidigital number, since it uses as much as digits as its factorization.

1609042381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1609042381 is about 40112.8705155839. The cubic root of 1609042381 is about 1171.8062977546.

The spelling of 1609042381 in words is "one billion, six hundred nine million, forty-two thousand, three hundred eighty-one".