10986991 has 4 divisors (see below), whose sum is σ = 10999152. Its totient is φ = 10974832.

The previous prime is 10986979. The next prime is 10987003. The reversal of 10986991 is 19968901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19968901 = 1187 ⋅16823.

It is an interprime number because it is at equal distance from previous prime (10986979) and next prime (10987003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10986991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10986901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4606 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (2749788).

Almost surely, 2^10986991 is an apocalyptic number.

10986991 is a deficient number, since it is larger than the sum of its proper divisors (12161).

10986991 is an equidigital number, since it uses as much as digits as its factorization.

10986991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12160.

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

The square root of 10986991 is about 3314.6630296306. The cubic root of 10986991 is about 222.3103024819.

The spelling of 10986991 in words is "ten million, nine hundred eighty-six thousand, nine hundred ninety-one".