10971991 has 2 divisors, whose sum is σ = 10971992. Its totient is φ = 10971990.

The previous prime is 10971959. The next prime is 10972001. The reversal of 10971991 is 19917901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10971991 - 2⁵ = 10971959 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10971991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10971931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5485995 + 5485996.

It is an arithmetic number, because the mean of its divisors is an integer number (5485996).

Almost surely, 2^10971991 is an apocalyptic number.

10971991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10971991 is an equidigital number, since it uses as much as digits as its factorization.

10971991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 10971991 is about 3312.3995833836. The cubic root of 10971991 is about 222.2090866217.

The spelling of 10971991 in words is "ten million, nine hundred seventy-one thousand, nine hundred ninety-one".