1255115251 has 4 divisors (see below), whose sum is σ = 1351662592. Its totient is φ = 1158567912.

The previous prime is 1255115237. The next prime is 1255115263. The reversal of 1255115251 is 1525115521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1525115521 = 307 ⋅4967803.

It is a cyclic number.

It is not a de Polignac number, because 1255115251 - 2⁷ = 1255115123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255115051) 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, 48273651 + ... + 48273676.

It is an arithmetic number, because the mean of its divisors is an integer number (337915648).

Almost surely, 2^1255115251 is an apocalyptic number.

1255115251 is a deficient number, since it is larger than the sum of its proper divisors (96547341).

1255115251 is an equidigital number, since it uses as much as digits as its factorization.

1255115251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96547340.

The product of its digits is 2500, while the sum is 28.

The square root of 1255115251 is about 35427.6057757224. The cubic root of 1255115251 is about 1078.6847417654.

The spelling of 1255115251 in words is "one billion, two hundred fifty-five million, one hundred fifteen thousand, two hundred fifty-one".