251343233011 has 4 divisors (see below), whose sum is σ = 270677327872. Its totient is φ = 232009138152.

The previous prime is 251343232993. The next prime is 251343233017. The reversal of 251343233011 is 110332343152.

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 251343233011 - 2¹³ = 251343224819 is a prime.

It is a super-2 number, since 2×251343233011² (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 (251343233017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9667047411 + ... + 9667047436.

It is an arithmetic number, because the mean of its divisors is an integer number (67669331968).

Almost surely, 2^251343233011 is an apocalyptic number.

251343233011 is a deficient number, since it is larger than the sum of its proper divisors (19334094861).

251343233011 is a wasteful number, since it uses less digits than its factorization.

251343233011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19334094860.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 251343233011 its reverse (110332343152), we get a palindrome (361675576163).

The spelling of 251343233011 in words is "two hundred fifty-one billion, three hundred forty-three million, two hundred thirty-three thousand, eleven".