11781057 has 4 divisors (see below), whose sum is σ = 15708080. Its totient is φ = 7854036.

The previous prime is 11781043. The next prime is 11781089. The reversal of 11781057 is 75018711.

It is a happy number.

11781057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11781057 - 2⁸ = 11780801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11781157) 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, 1963507 + ... + 1963512.

It is an arithmetic number, because the mean of its divisors is an integer number (3927020).

Almost surely, 2^11781057 is an apocalyptic number.

It is an amenable number.

11781057 is a deficient number, since it is larger than the sum of its proper divisors (3927023).

11781057 is an equidigital number, since it uses as much as digits as its factorization.

11781057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927022.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 11781057 is about 3432.3544397396. The cubic root of 11781057 is about 227.5419203836.

Adding to 11781057 its reverse (75018711), we get a palindrome (86799768).

The spelling of 11781057 in words is "eleven million, seven hundred eighty-one thousand, fifty-seven".