10689991 has 8 divisors (see below), whose sum is σ = 12189744. Its totient is φ = 9287040.

The previous prime is 10689983. The next prime is 10690007. The reversal of 10689991 is 19998601.

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 10689991 - 2³ = 10689983 is a prime.

It is a super-2 number, since 2×10689991² = 228551815160162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10689911) 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 7 ways as a sum of consecutive naturals, for example, 23965 + ... + 24406.

It is an arithmetic number, because the mean of its divisors is an integer number (1523718).

Almost surely, 2^10689991 is an apocalyptic number.

10689991 is a deficient number, since it is larger than the sum of its proper divisors (1499753).

10689991 is a wasteful number, since it uses less digits than its factorization.

10689991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48401.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 10689991 is about 3269.5551685206. Note that the first 3 decimals coincide. The cubic root of 10689991 is about 220.2888148942.

The spelling of 10689991 in words is "ten million, six hundred eighty-nine thousand, nine hundred ninety-one".