1131154551 has 24 divisors (see below), whose sum is σ = 1794081744. Its totient is φ = 709741440.

The previous prime is 1131154547. The next prime is 1131154553. The reversal of 1131154551 is 1554511311.

1131154551 is a `hidden beast` number, since 113 + 1 + 1 + 545 + 5 + 1 = 666.

It is not a de Polignac number, because 1131154551 - 2² = 1131154547 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131154553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132780 + ... + 141041.

It is an arithmetic number, because the mean of its divisors is an integer number (74753406).

Almost surely, 2^1131154551 is an apocalyptic number.

1131154551 is a deficient number, since it is larger than the sum of its proper divisors (662927193).

1131154551 is an equidigital number, since it uses as much as digits as its factorization.

1131154551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273853 (or 273841 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

The square root of 1131154551 is about 33632.6411540931. The cubic root of 1131154551 is about 1041.9350533555.

Adding to 1131154551 its reverse (1554511311), we get a palindrome (2685665862).

The spelling of 1131154551 in words is "one billion, one hundred thirty-one million, one hundred fifty-four thousand, five hundred fifty-one".