11777991 has 8 divisors (see below), whose sum is σ = 16627824. Its totient is φ = 7390080.

The previous prime is 11777971. The next prime is 11778007. The reversal of 11777991 is 19977711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11777991 - 2⁵ = 11777959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11777921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115420 + ... + 115521.

It is an arithmetic number, because the mean of its divisors is an integer number (2078478).

Almost surely, 2^11777991 is an apocalyptic number.

11777991 is a deficient number, since it is larger than the sum of its proper divisors (4849833).

11777991 is a wasteful number, since it uses less digits than its factorization.

11777991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230961.

The product of its digits is 27783, while the sum is 42.

The square root of 11777991 is about 3431.9077784812. The cubic root of 11777991 is about 227.5221795387.

The spelling of 11777991 in words is "eleven million, seven hundred seventy-seven thousand, nine hundred ninety-one".