2077991 has 4 divisors (see below), whose sum is σ = 2081184. Its totient is φ = 2074800.

The previous prime is 2077987. The next prime is 2077993. The reversal of 2077991 is 1997702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2077991 - 2² = 2077987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2077993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (520296).

2^2077991 is an apocalyptic number.

2077991 is a deficient number, since it is larger than the sum of its proper divisors (3193).

2077991 is an equidigital number, since it uses as much as digits as its factorization.

2077991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 2077991 is about 1441.5238464902. The cubic root of 2077991 is about 127.6089751387.

The spelling of 2077991 in words is "two million, seventy-seven thousand, nine hundred ninety-one".