1001691001 has 16 divisors (see below), whose sum is σ = 1094875200. Its totient is φ = 912800448.

The previous prime is 1001690971. The next prime is 1001691011. The reversal of 1001691001 is 1001961001.

It is a cyclic number.

It is not a de Polignac number, because 1001691001 - 2¹³ = 1001682809 is a prime.

It is a super-2 number, since 2×1001691001² = 2006769722968764002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

1001691001 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001691001.

It is not an unprimeable number, because it can be changed into a prime (1001691011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149346 + ... + 155908.

It is an arithmetic number, because the mean of its divisors is an integer number (68429700).

Almost surely, 2^1001691001 is an apocalyptic number.

It is an amenable number.

1001691001 is a deficient number, since it is larger than the sum of its proper divisors (93184199).

1001691001 is a wasteful number, since it uses less digits than its factorization.

1001691001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6888.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1001691001 is about 31649.5023815541. The cubic root of 1001691001 is about 1000.5633495777.

The spelling of 1001691001 in words is "one billion, one million, six hundred ninety-one thousand, one".