251320000043 has 4 divisors (see below), whose sum is σ = 287222857200. Its totient is φ = 215417142888.

The previous prime is 251320000031. The next prime is 251320000049. The reversal of 251320000043 is 340000023152.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 251320000043 - 2¹⁰ = 251319999019 is a prime.

It is a super-2 number, since 2×251320000043² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251320000049) 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, 17951428568 + ... + 17951428581.

It is an arithmetic number, because the mean of its divisors is an integer number (71805714300).

Almost surely, 2^251320000043 is an apocalyptic number.

251320000043 is a deficient number, since it is larger than the sum of its proper divisors (35902857157).

251320000043 is an equidigital number, since it uses as much as digits as its factorization.

251320000043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35902857156.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 251320000043 its reverse (340000023152), we get a palindrome (591320023195).

The spelling of 251320000043 in words is "two hundred fifty-one billion, three hundred twenty million, forty-three", and thus it is an aban number.