1251535055 has 4 divisors (see below), whose sum is σ = 1501842072. Its totient is φ = 1001228040.

The previous prime is 1251535039. The next prime is 1251535091. The reversal of 1251535055 is 5505351521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5505351521 = 53 ⋅103874557.

It is not a de Polignac number, because 1251535055 - 2⁴ = 1251535039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125153501 + ... + 125153510.

It is an arithmetic number, because the mean of its divisors is an integer number (375460518).

Almost surely, 2^1251535055 is an apocalyptic number.

1251535055 is a deficient number, since it is larger than the sum of its proper divisors (250307017).

1251535055 is an equidigital number, since it uses as much as digits as its factorization.

1251535055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250307016.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 1251535055 is about 35377.0413545282. The cubic root of 1251535055 is about 1077.6581214000.

Adding to 1251535055 its reverse (5505351521), we get a palindrome (6756886576).

The spelling of 1251535055 in words is "one billion, two hundred fifty-one million, five hundred thirty-five thousand, fifty-five".