3087991 has 2 divisors, whose sum is σ = 3087992.
Its totient is φ = 3087990.
The previous prime is 3087989. The next prime is 3088009. The reversal of 3087991 is 1997803.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 3087991 - 21 = 3087989 is a prime.
Together with 3087989, it forms a pair of twin primes.
It is a Chen prime.
3087991 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 3087991.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (3087901) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1543995 + 1543996.
It is an arithmetic number, because the mean of its divisors is an integer number (1543996).
Almost surely, 23087991 is an apocalyptic number.
3087991 is a deficient number, since it is larger than the sum of its proper divisors (1).
3087991 is an equidigital number, since it uses as much as digits as its factorization.
3087991 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 13608, while the sum is 37.
The square root of 3087991 is about 1757.2680501278.
The cubic root of 3087991 is about 145.6214469222.
The spelling of 3087991 in words is "three million, eighty-seven thousand, nine hundred ninety-one".