1125552551 has 4 divisors (see below), whose sum is σ = 1126095504. Its totient is φ = 1125009600.

The previous prime is 1125552521. The next prime is 1125552559. The reversal of 1125552551 is 1552555211.

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 1125552551 - 2¹⁸ = 1125290407 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 (1125552559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268355 + ... + 272516.

It is an arithmetic number, because the mean of its divisors is an integer number (281523876).

Almost surely, 2^1125552551 is an apocalyptic number.

1125552551 is a deficient number, since it is larger than the sum of its proper divisors (542953).

1125552551 is an equidigital number, since it uses as much as digits as its factorization.

1125552551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542952.

The product of its digits is 12500, while the sum is 32.

The square root of 1125552551 is about 33549.2555953184. The cubic root of 1125552551 is about 1040.2121580855.

The spelling of 1125552551 in words is "one billion, one hundred twenty-five million, five hundred fifty-two thousand, five hundred fifty-one".