251040013 has 8 divisors (see below), whose sum is σ = 287081600. Its totient is φ = 215043120.

The previous prime is 251040001. The next prime is 251040029. The reversal of 251040013 is 310040152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251040013 - 2⁹ = 251039501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251040313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1888 + ... + 22486.

It is an arithmetic number, because the mean of its divisors is an integer number (35885200).

Almost surely, 2^251040013 is an apocalyptic number.

It is an amenable number.

251040013 is a deficient number, since it is larger than the sum of its proper divisors (36041587).

251040013 is a wasteful number, since it uses less digits than its factorization.

251040013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22347.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 251040013 is about 15844.2422665144. The cubic root of 251040013 is about 630.8328725735.

Adding to 251040013 its reverse (310040152), we get a palindrome (561080165).

The spelling of 251040013 in words is "two hundred fifty-one million, forty thousand, thirteen".