1125051553 has 4 divisors (see below), whose sum is σ = 1125119380. Its totient is φ = 1124983728.

The previous prime is 1125051547. The next prime is 1125051559. The reversal of 1125051553 is 3551505211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3551505211 = 2861 ⋅1241351.

It is an interprime number because it is at equal distance from previous prime (1125051547) and next prime (1125051559).

It can be written as a sum of positive squares in 2 ways, for example, as 730512784 + 394538769 = 27028^2 + 19863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125051553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125051559) 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, 9451 + ... + 48367.

It is an arithmetic number, because the mean of its divisors is an integer number (281279845).

Almost surely, 2^1125051553 is an apocalyptic number.

It is an amenable number.

1125051553 is a deficient number, since it is larger than the sum of its proper divisors (67827).

1125051553 is an equidigital number, since it uses as much as digits as its factorization.

1125051553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67826.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 1125051553 is about 33541.7881604425. The cubic root of 1125051553 is about 1040.0577978850.

Adding to 1125051553 its reverse (3551505211), we get a palindrome (4676556764).

The spelling of 1125051553 in words is "one billion, one hundred twenty-five million, fifty-one thousand, five hundred fifty-three".