1618379849 has 2 divisors, whose sum is σ = 1618379850. Its totient is φ = 1618379848.

The previous prime is 1618379813. The next prime is 1618379911. The reversal of 1618379849 is 9489738161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1412256400 + 206123449 = 37580^2 + 14357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618379849 - 2¹² = 1618375753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1618379794 and 1618379803.

It is not a weakly prime, because it can be changed into another prime (1618372849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809189924 + 809189925.

It is an arithmetic number, because the mean of its divisors is an integer number (809189925).

Almost surely, 2^1618379849 is an apocalyptic number.

It is an amenable number.

1618379849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618379849 is an equidigital number, since it uses as much as digits as its factorization.

1618379849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The square root of 1618379849 is about 40229.0920727774. The cubic root of 1618379849 is about 1174.0686385036.

The spelling of 1618379849 in words is "one billion, six hundred eighteen million, three hundred seventy-nine thousand, eight hundred forty-nine".