1191691 has 2 divisors, whose sum is σ = 1191692. Its totient is φ = 1191690.

The previous prime is 1191679. The next prime is 1191703. The reversal of 1191691 is 1961911.

It is a balanced prime because it is at equal distance from previous prime (1191679) and next prime (1191703).

It is a cyclic number.

It is not a de Polignac number, because 1191691 - 2⁷ = 1191563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595845 + 595846.

It is an arithmetic number, because the mean of its divisors is an integer number (595846).

2^1191691 is an apocalyptic number.

1191691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191691 is an equidigital number, since it uses as much as digits as its factorization.

1191691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 28.

The square root of 1191691 is about 1091.6460048935. The cubic root of 1191691 is about 106.0200211381.

The spelling of 1191691 in words is "one million, one hundred ninety-one thousand, six hundred ninety-one".