10811557 has 4 divisors (see below), whose sum is σ = 10866636. Its totient is φ = 10756480.

The previous prime is 10811543. The next prime is 10811597. The reversal of 10811557 is 75511801.

10811557 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.

It can be written as a sum of positive squares in 2 ways, for example, as 5909761 + 4901796 = 2431^2 + 2214^2 .

It is a cyclic number.

It is not a de Polignac number, because 10811557 - 2²³ = 2422949 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 (10811597) 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, 27244 + ... + 27637.

It is an arithmetic number, because the mean of its divisors is an integer number (2716659).

Almost surely, 2^10811557 is an apocalyptic number.

It is an amenable number.

10811557 is a deficient number, since it is larger than the sum of its proper divisors (55079).

10811557 is an equidigital number, since it uses as much as digits as its factorization.

10811557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55078.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 10811557 is about 3288.0932164402. The cubic root of 10811557 is about 221.1207069076.

The spelling of 10811557 in words is "ten million, eight hundred eleven thousand, five hundred fifty-seven".