1001219985 has 12 divisors (see below), whose sum is σ = 1735448052. Its totient is φ = 533983968.

The previous prime is 1001219977. The next prime is 1001219987. The reversal of 1001219985 is 5899121001.

It can be written as a sum of positive squares in 2 ways, for example, as 176783616 + 824436369 = 13296^2 + 28713^2 .

It is not a de Polignac number, because 1001219985 - 2³ = 1001219977 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1001219987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11124622 + ... + 11124711.

It is an arithmetic number, because the mean of its divisors is an integer number (144620671).

Almost surely, 2^1001219985 is an apocalyptic number.

1001219985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1001219985 is a deficient number, since it is larger than the sum of its proper divisors (734228067).

1001219985 is a wasteful number, since it uses less digits than its factorization.

1001219985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22249344 (or 22249341 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 1001219985 is about 31642.0603785531. The cubic root of 1001219985 is about 1000.4064964049.

The spelling of 1001219985 in words is "one billion, one million, two hundred nineteen thousand, nine hundred eighty-five".