11887591 has 2 divisors, whose sum is σ = 11887592. Its totient is φ = 11887590.

The previous prime is 11887583. The next prime is 11887613. The reversal of 11887591 is 19578811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11887591 - 2³ = 11887583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11887511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5943795 + 5943796.

It is an arithmetic number, because the mean of its divisors is an integer number (5943796).

Almost surely, 2^11887591 is an apocalyptic number.

11887591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11887591 is an equidigital number, since it uses as much as digits as its factorization.

11887591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 40.

The square root of 11887591 is about 3447.8385983105. The cubic root of 11887591 is about 228.2257369818.

The spelling of 11887591 in words is "eleven million, eight hundred eighty-seven thousand, five hundred ninety-one".