11291999 has 2 divisors, whose sum is σ = 11292000. Its totient is φ = 11291998.

The previous prime is 11291981. The next prime is 11292037. The reversal of 11291999 is 99919211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11291999 - 2⁸ = 11291743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11291939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5645999 + 5646000.

It is an arithmetic number, because the mean of its divisors is an integer number (5646000).

Almost surely, 2^11291999 is an apocalyptic number.

11291999 is a deficient number, since it is larger than the sum of its proper divisors (1).

11291999 is an equidigital number, since it uses as much as digits as its factorization.

11291999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 41.

The square root of 11291999 is about 3360.3569750846. The cubic root of 11291999 is about 224.3487273806.

The spelling of 11291999 in words is "eleven million, two hundred ninety-one thousand, nine hundred ninety-nine".