1251341355143 has 4 divisors (see below), whose sum is σ = 1365099660168. Its totient is φ = 1137583050120.

The previous prime is 1251341355133. The next prime is 1251341355151. The reversal of 1251341355143 is 3415531431521.

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

It is not a de Polignac number, because 1251341355143 - 2³⁴ = 1234161485959 is a prime.

It is a super-2 number, since 2×1251341355143² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1251341355097 and 1251341355106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251341355113) 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, 56879152496 + ... + 56879152517.

It is an arithmetic number, because the mean of its divisors is an integer number (341274915042).

Almost surely, 2^{1251341355143} is an apocalyptic number.

1251341355143 is a deficient number, since it is larger than the sum of its proper divisors (113758305025).

1251341355143 is a wasteful number, since it uses less digits than its factorization.

1251341355143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113758305024.

The product of its digits is 108000, while the sum is 38.

Adding to 1251341355143 its reverse (3415531431521), we get a palindrome (4666872786664).

The spelling of 1251341355143 in words is "one trillion, two hundred fifty-one billion, three hundred forty-one million, three hundred fifty-five thousand, one hundred forty-three".