1251143455 has 4 divisors (see below), whose sum is σ = 1501372152. Its totient is φ = 1000914760.

The previous prime is 1251143449. The next prime is 1251143473. The reversal of 1251143455 is 5543411521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1251143455 - 2⁹ = 1251142943 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, 125114341 + ... + 125114350.

It is an arithmetic number, because the mean of its divisors is an integer number (375343038).

Almost surely, 2^1251143455 is an apocalyptic number.

1251143455 is a deficient number, since it is larger than the sum of its proper divisors (250228697).

1251143455 is an equidigital number, since it uses as much as digits as its factorization.

1251143455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250228696.

The product of its digits is 12000, while the sum is 31.

The square root of 1251143455 is about 35371.5062585692. The cubic root of 1251143455 is about 1077.5457114595.

Adding to 1251143455 its reverse (5543411521), we get a palindrome (6794554976).

The spelling of 1251143455 in words is "one billion, two hundred fifty-one million, one hundred forty-three thousand, four hundred fifty-five".