1618039849 has 2 divisors, whose sum is σ = 1618039850. Its totient is φ = 1618039848.

The previous prime is 1618039793. The next prime is 1618039861. The reversal of 1618039849 is 9489308161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1112689449 + 505350400 = 33357^2 + 22480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618039849 - 2⁷ = 1618039721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1618039649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809019924 + 809019925.

It is an arithmetic number, because the mean of its divisors is an integer number (809019925).

Almost surely, 2^1618039849 is an apocalyptic number.

It is an amenable number.

1618039849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618039849 is an equidigital number, since it uses as much as digits as its factorization.

1618039849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1618039849 is about 40224.8660532263. The cubic root of 1618039849 is about 1173.9864140298.

The spelling of 1618039849 in words is "one billion, six hundred eighteen million, thirty-nine thousand, eight hundred forty-nine".