1131155406 has 12 divisors (see below), whose sum is σ = 2450836752. Its totient is φ = 377051796.

The previous prime is 1131155381. The next prime is 1131155413. The reversal of 1131155406 is 6045511311.

1131155406 is a `hidden beast` number, since 1 + 1 + 3 + 115 + 540 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1131155406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31420966 + ... + 31421001.

It is an arithmetic number, because the mean of its divisors is an integer number (204236396).

Almost surely, 2^1131155406 is an apocalyptic number.

1131155406 is an abundant number, since it is smaller than the sum of its proper divisors (1319681346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131155406 is a wasteful number, since it uses less digits than its factorization.

1131155406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62841975 (or 62841972 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1131155406 is about 33632.6538649569. The cubic root of 1131155406 is about 1041.9353158762.

Adding to 1131155406 its reverse (6045511311), we get a palindrome (7176666717).

The spelling of 1131155406 in words is "one billion, one hundred thirty-one million, one hundred fifty-five thousand, four hundred six".