1147205985 has 16 divisors (see below), whose sum is σ = 1943502336. Its totient is φ = 575852288.

The previous prime is 1147205963. The next prime is 1147205989. The reversal of 1147205985 is 5895027411.

It is not a de Polignac number, because 1147205985 - 2⁹ = 1147205473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1147205989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2249169 + ... + 2249678.

It is an arithmetic number, because the mean of its divisors is an integer number (121468896).

Almost surely, 2^1147205985 is an apocalyptic number.

1147205985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1147205985 is a deficient number, since it is larger than the sum of its proper divisors (796296351).

1147205985 is a wasteful number, since it uses less digits than its factorization.

1147205985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498872.

The product of its (nonzero) digits is 100800, while the sum is 42.

The square root of 1147205985 is about 33870.4293595461. The cubic root of 1147205985 is about 1046.8403838379.

The spelling of 1147205985 in words is "one billion, one hundred forty-seven million, two hundred five thousand, nine hundred eighty-five".