1617728947 has 2 divisors, whose sum is σ = 1617728948. Its totient is φ = 1617728946.

The previous prime is 1617728839. The next prime is 1617728969. The reversal of 1617728947 is 7498277161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1617728947 - 2²⁷ = 1483511219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1617728894 and 1617728903.

It is not a weakly prime, because it can be changed into another prime (1617726947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808864473 + 808864474.

It is an arithmetic number, because the mean of its divisors is an integer number (808864474).

Almost surely, 2^1617728947 is an apocalyptic number.

1617728947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617728947 is an equidigital number, since it uses as much as digits as its factorization.

1617728947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 52.

The square root of 1617728947 is about 40221.0013177196. The cubic root of 1617728947 is about 1173.9112164372.

The spelling of 1617728947 in words is "one billion, six hundred seventeen million, seven hundred twenty-eight thousand, nine hundred forty-seven".