1001000991975 has 12 divisors (see below), whose sum is σ = 1654988306856. Its totient is φ = 533867195680.

The previous prime is 1001000991943. The next prime is 1001000991983. The reversal of 1001000991975 is 5791990001001.

It is a happy number.

It is not a de Polignac number, because 1001000991975 - 2⁵ = 1001000991943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6673339872 + ... + 6673340021.

It is an arithmetic number, because the mean of its divisors is an integer number (137915692238).

Almost surely, 2^{1001000991975} is an apocalyptic number.

1001000991975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1001000991975 is a deficient number, since it is larger than the sum of its proper divisors (653987314881).

1001000991975 is a wasteful number, since it uses less digits than its factorization.

1001000991975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13346679906 (or 13346679901 counting only the distinct ones).

The product of its (nonzero) digits is 25515, while the sum is 42.

Adding to 1001000991975 its reverse (5791990001001), we get a palindrome (6792990992976).

The spelling of 1001000991975 in words is "one trillion, one billion, nine hundred ninety-one thousand, nine hundred seventy-five".