1251115254 has 32 divisors (see below), whose sum is σ = 2821760640. Its totient is φ = 410812776.

The previous prime is 1251115253. The next prime is 1251115277. The reversal of 1251115254 is 4525111521.

It is a happy number.

1251115254 is a `hidden beast` number, since 1 + 25 + 111 + 525 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251115253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169284 + ... + 176519.

It is an arithmetic number, because the mean of its divisors is an integer number (88180020).

Almost surely, 2^1251115254 is an apocalyptic number.

1251115254 is an abundant number, since it is smaller than the sum of its proper divisors (1570645386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251115254 is a wasteful number, since it uses less digits than its factorization.

1251115254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345881 (or 345875 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1251115254 is about 35371.1076162452. The cubic root of 1251115254 is about 1077.5376153735.

Adding to 1251115254 its reverse (4525111521), we get a palindrome (5776226775).

It can be divided in two parts, 1 and 251115254, that added together give a triangular number (251115255 = T₂₂₄₁₀).

The spelling of 1251115254 in words is "one billion, two hundred fifty-one million, one hundred fifteen thousand, two hundred fifty-four".