11161557 has 20 divisors (see below), whose sum is σ = 18190656. Its totient is φ = 6764040.

The previous prime is 11161547. The next prime is 11161559. The reversal of 11161557 is 75516111.

It is a happy number.

It is not a de Polignac number, because 11161557 - 2⁸ = 11161301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 11161557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11161559) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5373 + ... + 7154.

Almost surely, 2^11161557 is an apocalyptic number.

It is an amenable number.

11161557 is a deficient number, since it is larger than the sum of its proper divisors (7029099).

11161557 is a wasteful number, since it uses less digits than its factorization.

11161557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12550 (or 12541 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 11161557 is about 3340.8916474498. The cubic root of 11161557 is about 223.4815083120.

Adding to 11161557 its reverse (75516111), we get a palindrome (86677668).

The spelling of 11161557 in words is "eleven million, one hundred sixty-one thousand, five hundred fifty-seven".