11781011 has 8 divisors (see below), whose sum is σ = 13151424. Its totient is φ = 10460520.

The previous prime is 11781001. The next prime is 11781013. The reversal of 11781011 is 11018711.

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

It is a cyclic number.

It is not a de Polignac number, because 11781011 - 2⁶ = 11780947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11781013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11981 + ... + 12926.

It is an arithmetic number, because the mean of its divisors is an integer number (1643928).

Almost surely, 2^11781011 is an apocalyptic number.

11781011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11781011 is a deficient number, since it is larger than the sum of its proper divisors (1370413).

11781011 is a wasteful number, since it uses less digits than its factorization.

11781011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24961.

The product of its (nonzero) digits is 56, while the sum is 20.

The square root of 11781011 is about 3432.3477387934. The cubic root of 11781011 is about 227.5416242318.

Adding to 11781011 its reverse (11018711), we get a palindrome (22799722).

The spelling of 11781011 in words is "eleven million, seven hundred eighty-one thousand, eleven".