1113551551 has 4 divisors (see below), whose sum is σ = 1272630352. Its totient is φ = 954472752.

The previous prime is 1113551501. The next prime is 1113551567. The reversal of 1113551551 is 1551553111.

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 1113551551 - 2⁷ = 1113551423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113551501) 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, 79539390 + ... + 79539403.

It is an arithmetic number, because the mean of its divisors is an integer number (318157588).

Almost surely, 2^1113551551 is an apocalyptic number.

1113551551 is a deficient number, since it is larger than the sum of its proper divisors (159078801).

1113551551 is an equidigital number, since it uses as much as digits as its factorization.

1113551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159078800.

The product of its digits is 1875, while the sum is 28.

The square root of 1113551551 is about 33369.9198530653. The cubic root of 1113551551 is about 1036.5019155662.

The spelling of 1113551551 in words is "one billion, one hundred thirteen million, five hundred fifty-one thousand, five hundred fifty-one".