1605159979 has 2 divisors, whose sum is σ = 1605159980. Its totient is φ = 1605159978.

The previous prime is 1605159971. The next prime is 1605160001. The reversal of 1605159979 is 9799515061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605159979 - 2³ = 1605159971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605159971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802579989 + 802579990.

It is an arithmetic number, because the mean of its divisors is an integer number (802579990).

Almost surely, 2^1605159979 is an apocalyptic number.

1605159979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605159979 is an equidigital number, since it uses as much as digits as its factorization.

1605159979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 765450, while the sum is 52.

The square root of 1605159979 is about 40064.4478184837. The cubic root of 1605159979 is about 1170.8630685958.

The spelling of 1605159979 in words is "one billion, six hundred five million, one hundred fifty-nine thousand, nine hundred seventy-nine".