1251181055 has 4 divisors (see below), whose sum is σ = 1501417272. Its totient is φ = 1000944840.

The previous prime is 1251181021. The next prime is 1251181073. The reversal of 1251181055 is 5501811521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5501811521 = 31 ⋅177477791.

It is not a de Polignac number, because 1251181055 - 2¹² = 1251176959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125118101 + ... + 125118110.

It is an arithmetic number, because the mean of its divisors is an integer number (375354318).

Almost surely, 2^1251181055 is an apocalyptic number.

1251181055 is a deficient number, since it is larger than the sum of its proper divisors (250236217).

1251181055 is an equidigital number, since it uses as much as digits as its factorization.

1251181055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250236216.

The product of its (nonzero) digits is 2000, while the sum is 29.

The square root of 1251181055 is about 35372.0377558319. The cubic root of 1251181055 is about 1077.5565056688.

Adding to 1251181055 its reverse (5501811521), we get a palindrome (6752992576).

The spelling of 1251181055 in words is "one billion, two hundred fifty-one million, one hundred eighty-one thousand, fifty-five".