1121177551 has 4 divisors (see below), whose sum is σ = 1207421992. Its totient is φ = 1034933112.

The previous prime is 1121177539. The next prime is 1121177579. The reversal of 1121177551 is 1557711211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121177551 - 2²¹ = 1119080399 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 (1121177051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43122201 + ... + 43122226.

It is an arithmetic number, because the mean of its divisors is an integer number (301855498).

Almost surely, 2^1121177551 is an apocalyptic number.

1121177551 is a deficient number, since it is larger than the sum of its proper divisors (86244441).

1121177551 is an equidigital number, since it uses as much as digits as its factorization.

1121177551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86244440.

The product of its digits is 2450, while the sum is 31.

The square root of 1121177551 is about 33483.9894725823. The cubic root of 1121177551 is about 1038.8626468584.

Adding to 1121177551 its reverse (1557711211), we get a palindrome (2678888762).

The spelling of 1121177551 in words is "one billion, one hundred twenty-one million, one hundred seventy-seven thousand, five hundred fifty-one".