1001491689 has 8 divisors (see below), whose sum is σ = 1456715232. Its totient is φ = 606964640.

The previous prime is 1001491681. The next prime is 1001491697. The reversal of 1001491689 is 9861941001.

It is an interprime number because it is at equal distance from previous prime (1001491681) and next prime (1001491697).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001491689 - 2³ = 1001491681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1001491681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15174084 + ... + 15174149.

It is an arithmetic number, because the mean of its divisors is an integer number (182089404).

Almost surely, 2^1001491689 is an apocalyptic number.

It is an amenable number.

1001491689 is a deficient number, since it is larger than the sum of its proper divisors (455223543).

1001491689 is a wasteful number, since it uses less digits than its factorization.

1001491689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30348247.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1001491689 is about 31646.3534866183. The cubic root of 1001491689 is about 1000.4969826340.

The spelling of 1001491689 in words is "one billion, one million, four hundred ninety-one thousand, six hundred eighty-nine".