251234140033 has 4 divisors (see below), whose sum is σ = 253721606868. Its totient is φ = 248746673200.

The previous prime is 251234139983. The next prime is 251234140037. The reversal of 251234140033 is 330041432152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 247509235009 + 3724905024 = 497503^2 + 61032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251234140033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251234139983 and 251234140010.

It is not an unprimeable number, because it can be changed into a prime (251234140037) 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, 1243733266 + ... + 1243733467.

It is an arithmetic number, because the mean of its divisors is an integer number (63430401717).

Almost surely, 2^251234140033 is an apocalyptic number.

It is an amenable number.

251234140033 is a deficient number, since it is larger than the sum of its proper divisors (2487466835).

251234140033 is a wasteful number, since it uses less digits than its factorization.

251234140033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487466834.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 251234140033 its reverse (330041432152), we get a palindrome (581275572185).

The spelling of 251234140033 in words is "two hundred fifty-one billion, two hundred thirty-four million, one hundred forty thousand, thirty-three".