11991097 has 2 divisors, whose sum is σ = 11991098. Its totient is φ = 11991096.

The previous prime is 11991047. The next prime is 11991107. The reversal of 11991097 is 79019911.

11991097 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8590761 + 3400336 = 2931^2 + 1844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11991097 is a prime.

It is not a weakly prime, because it can be changed into another prime (11991047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995548 + 5995549.

It is an arithmetic number, because the mean of its divisors is an integer number (5995549).

Almost surely, 2^11991097 is an apocalyptic number.

It is an amenable number.

11991097 is a deficient number, since it is larger than the sum of its proper divisors (1).

11991097 is an equidigital number, since it uses as much as digits as its factorization.

11991097 is an evil number, because the sum of its binary digits is even.

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

The square root of 11991097 is about 3462.8163393400. The cubic root of 11991097 is about 228.8862156644.

The spelling of 11991097 in words is "eleven million, nine hundred ninety-one thousand, ninety-seven".