11897791 has 2 divisors, whose sum is σ = 11897792. Its totient is φ = 11897790.

The previous prime is 11897783. The next prime is 11897803. The reversal of 11897791 is 19779811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11897791 - 2³ = 11897783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11897701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5948895 + 5948896.

It is an arithmetic number, because the mean of its divisors is an integer number (5948896).

Almost surely, 2^11897791 is an apocalyptic number.

11897791 is a deficient number, since it is larger than the sum of its proper divisors (1).

11897791 is an equidigital number, since it uses as much as digits as its factorization.

11897791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 43.

The square root of 11897791 is about 3449.3174687175. The cubic root of 11897791 is about 228.2909937420.

The spelling of 11897791 in words is "eleven million, eight hundred ninety-seven thousand, seven hundred ninety-one".