1125420551 has 4 divisors (see below), whose sum is σ = 1125625152. Its totient is φ = 1125215952.

The previous prime is 1125420529. The next prime is 1125420563. The reversal of 1125420551 is 1550245211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1550245211 = 107 ⋅14488273.

It is a cyclic number.

It is not a de Polignac number, because 1125420551 - 2¹⁴ = 1125404167 is a prime.

It is a super-2 number, since 2×1125420551² = 2533142833226287202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1125420551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125420511) 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, 93815 + ... + 105128.

It is an arithmetic number, because the mean of its divisors is an integer number (281406288).

Almost surely, 2^1125420551 is an apocalyptic number.

1125420551 is a deficient number, since it is larger than the sum of its proper divisors (204601).

1125420551 is an equidigital number, since it uses as much as digits as its factorization.

1125420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204600.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1125420551 is about 33547.2882808730. The cubic root of 1125420551 is about 1040.1714926148.

Adding to 1125420551 its reverse (1550245211), we get a palindrome (2675665762).

The spelling of 1125420551 in words is "one billion, one hundred twenty-five million, four hundred twenty thousand, five hundred fifty-one".