251072043007431 has 4 divisors (see below), whose sum is σ = 334762724009912. Its totient is φ = 167381362004952.

The previous prime is 251072043007411. The next prime is 251072043007477. The reversal of 251072043007431 is 134700340270152.

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

It is not a de Polignac number, because 251072043007431 - 2⁴⁷ = 110334554652103 is a prime.

It is a super-2 number, since 2×251072043007431² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251072043007431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251072043007411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41845340501236 + ... + 41845340501241.

It is an arithmetic number, because the mean of its divisors is an integer number (83690681002478).

Almost surely, 2^{251072043007431} is an apocalyptic number.

251072043007431 is a deficient number, since it is larger than the sum of its proper divisors (83690681002481).

251072043007431 is an equidigital number, since it uses as much as digits as its factorization.

251072043007431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83690681002480.

The product of its (nonzero) digits is 141120, while the sum is 39.

Adding to 251072043007431 its reverse (134700340270152), we get a palindrome (385772383277583).

The spelling of 251072043007431 in words is "two hundred fifty-one trillion, seventy-two billion, forty-three million, seven thousand, four hundred thirty-one".